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Formula for identifying acid-base disorders
In nephrology, the delta ratio, or "delta-delta" (denoted Δ/Δ), is a formula that can be used to evaluate whether a mixed acid–base disorder (metabolic
Delta_ratio
Measure of material deformation perpendicular to loading
\Delta d=-d\left(1-{\left(1+{\frac {\Delta L}{L}}\right)}^{-\nu }\right)} where d is original diameter Δd is rod diameter change ν is Poisson's ratio L
Poisson's_ratio
Fourth letter in the Greek alphabet
Silver ratio U+018D ƍ LATIN SMALL LETTER TURNED DELTA U+0394 Δ GREEK CAPITAL LETTER DELTA (Δ) (\Delta in TeX) U+03B4 δ GREEK SMALL LETTER DELTA (δ)
Delta_(letter)
Topics referred to by the same term
Arkansas Delta Delta, Alabama Delta Junction, Alaska Delta, Colorado Delta, Iowa Delta, Kentucky Delta, Louisiana Delta, Missouri Delta, Ohio Delta, Pennsylvania
Delta
Medical ratio
In survival analysis, the hazard ratio (HR) is the ratio of the hazard rates corresponding to the conditions characterised by two distinct levels of a
Hazard_ratio
Medical condition
it may be caused by ingesting methanol or overdosing on aspirin. The delta ratio is a formula that can be used to assess elevated anion gap metabolic
High anion gap metabolic acidosis
High_anion_gap_metabolic_acidosis
Physical quantity of interest in chemistry and electrodynamics
{4\pi c}{B(m_{j,f}g_{J,f}-m_{j,i}g_{J,i})}}{\frac {\delta D}{D\Delta D}}\,.} Gyromagnetic ratio Thomson (unit) IUPAC, Compendium of Chemical Terminology
Mass-to-charge_ratio
Liquid by-product of animal metabolism
diluted with water (at a 1:5 ratio for container-grown annual crops with fresh growing medium each season or a 1:8 ratio for more general use), it can
Urine
Measure of relative carbon-13 concentration in a sample
archaeology, and paleoceanography, δ13C (pronounced "delta carbon thirteen") is a normalized ratio of the two stable isotopes of carbon—13C and 12C—reported
Δ13C
Measure of amount of effort to change trajectory
Delta-v (also known as "change in velocity"), symbolized as Δ v {\textstyle {\Delta v}} and pronounced /dɛltə viː/, as used in spacecraft flight dynamics
Delta-v
In probability, a theory
ratio is related to the hazard rate h(x) which is defined as h ( x ) := lim δ → 0 1 δ Pr [ x < X ≤ x + δ | X > x ] {\displaystyle h(x):=\lim _{\delta
Mills_ratio
Measure of the efficiency of a rocket based on its propellant's mass
lower mass ratio; however, for any given efficiency a higher mass ratio typically permits the vehicle to achieve higher delta-v. The mass ratio is a useful
Rocket_mass_ratio
Ratio of neutrons to protons in an atomic nucleus
The neutron–proton ratio (N/Z ratio or nuclear ratio) of an atomic nucleus is the ratio of its number of neutrons to its number of protons. Among stable
Neutron–proton_ratio
Ratio of how much additional investment is needed to generate one unit of extra output
Capital Output Ratio (ICOR)}}={\frac {\Delta K}{\Delta Y}}={\frac {\frac {\Delta K}{Y}}{\frac {\Delta Y}{Y}}}={\frac {\frac {I}{Y}}{\frac {\Delta Y}{Y}}}} According
Incremental capital-output ratio
Incremental_capital-output_ratio
Ratio of lengths of fingers
The digit ratio is the ratio taken of the lengths of different digits or fingers on a hand. The most commonly studied digit ratio is that of the 2nd (index
Digit_ratio
Method for converting signals between digital and analog
makes its dynamic range and signal-to-noise ratio (SNR) inversely proportional to signal frequency. Delta modulation suffers from slope overload if signals
Delta-sigma_modulation
Motor vehicle
thanks to a raised compression ratio and electronic ignition. November 1982 brought the first facelift for the Delta. The bumpers were changed from three-piece
Lancia_Delta
Proportion of observed intensity to ideal intensity, in astronomical imaging
definition, the Strehl ratio S {\displaystyle S} can be computed in terms of the wavefront-error δ ( x , y ) {\displaystyle \delta (x,y)} : the offset of
Strehl_ratio
Number, approximately 1.46557
the supergolden ratio m ( x ) = x 3 − x 2 − 1 {\displaystyle m(x)=x^{3}-x^{2}-1} has discriminant Δ = − 31. {\displaystyle \Delta =-31.} The Hilbert
Supergolden_ratio
Mathematical equation describing the motion of a rocket
necessary wet mass grows exponentially with the desired delta-v. We can also express this as the ratio of fuel mass to payload mass: m 0 − m f m f = e Δ v
Tsiolkovsky_rocket_equation
Triangle shaped aircraft wing configuration
A delta wing is a wing shaped in the form of a triangle. It is named for its similarity in shape to the Greek uppercase letter delta (Δ). Although long
Delta_wing
Measure for the damping of an oscillator
Logarithmic decrement, δ {\displaystyle \delta } , is used to find the damping ratio of an underdamped system in the time domain. The method of logarithmic
Logarithmic_decrement
Influence on an oscillating physical system which reduces or prevents its oscillation
also related to the logarithmic decrement δ {\displaystyle \delta } . The damping ratio can be found for any two peaks, even if they are not adjacent
Damping
12-cylinder inverted-V aircraft engine
nacelle. Delta R.C.20/55 ID-IS Delta R.C.21/60 Delta R.C.35 Delta R.C.35 I Delta R.C.35 IS Delta R.C.40 IS Delta R.C.40 ID-IS Delta R.C.48 Delta III R.C
Isotta_Fraschini_Delta
Bet sizing formula for long-term growth
yearly Sharpe ratio and Kelly ratio are calculated to be 25% and 150%. Daily Sharpe ratio and Kelly ratio are 1.7% and 150%. Sharpe ratio implies daily
Kelly_criterion
Difference in quantities of cations and anions in blood or urine
the presence of a significant quantity of unmeasured anions. Osmol gap Delta ratio Oh MS, Carroll HJ (1977). "The anion gap". N. Engl. J. Med. 297 (15):
Anion_gap
Electrophysiological method to record electrical activity of the brain
Quantitative analysis displays like power spectrum analysis, alpha-delta ratio, amplitude integrated EEG, and spike detection can help quickly identify
Electroencephalography
Relative deformation of a physical body
metric tensor or its dual is considered. Strain has dimension of a length ratio, with SI base units of meter per meter (m/m). Hence strains are dimensionless
Strain_(mechanics)
Financial calculation
Modigliani risk-adjusted performance Omega ratio Sharpe ratio Sortino ratio Treynor ratio Upside potential ratio Evaluating Mutual Fund Performance Jensen
Jensen's_alpha
Imbalance in the body's acid-base equilibrium
and a combined endpoint of death, dialysis, or 50% decline in eGFR. Delta ratio Metabolic alkalosis Pseudohypoxia Respiratory acidosis Respiratory alkalosis
Metabolic_acidosis
Describes the general shape and layout of an aircraft wing
many modern combat aircraft may be described either as cropped compound deltas with (forwards or backwards) swept trailing edge, or as sharply tapered
Wing_configuration
Variable
units of velocity. v = V / Δ t A {\displaystyle v={V/\Delta t \over {A}}} The air-to-cloth ratio is typically between 1.5 and 3.5 metres per minute, mainly
Air-to-cloth_ratio
Number, approximately 1.3247
polynomial of the plastic ratio m ( x ) = x 3 − x − 1 {\displaystyle m(x)=x^{3}-x-1} has discriminant Δ = − 23. {\displaystyle \Delta =-23.} The Hilbert class
Plastic_ratio
Mathematical curve outputted from a specific pair of parametric equations
(depending on the ratio a/b). Lissajous figures where a = 1, b = N (N is a natural number) and δ = N − 1 N π 2 {\displaystyle \delta ={\frac {N-1}{N}}{\frac
Lissajous_curve
Measure of equal representation
δ = max i a i , {\displaystyle \delta =\max _{i}a_{i},} The D'Hondt method minimizes the largest seats-to-votes ratio by assigning the seats, δ ∗ = min
Seats-to-votes_ratio
Unit in physics
{\displaystyle \Delta L/L_{0}} Δ L {\displaystyle \Delta L} = absolute change in length L 0 {\displaystyle L_{0}} = original length ν = Poisson's ratio ρ = resistivity
Gauge_factor
Delta of the river Niger
The Niger Delta is the delta of the Niger River sitting directly on the Gulf of Guinea on the Atlantic Ocean in Nigeria. It is located within nine coastal
Niger_Delta
Formula in materials science
{\displaystyle \Delta K} seen in a loading cycle. The Paris equation is d a d N = C ( Δ K ) m , {\displaystyle {\begin{aligned}{da \over dN}&=C\left(\Delta K\right)^{m}
Paris'_law
Invariant in projective geometry
In geometry, the cross-ratio, also called the double ratio and anharmonic ratio, is a number associated with a list of four collinear points, particularly
Cross-ratio
Equation to derive time of sunset and sunrise
H 0 = − tan ϕ tan δ {\displaystyle \cos H_{0}=-\tan \phi \,\tan \delta } where: H 0 {\displaystyle H_{0}} is the solar hour angle at either sunrise
Sunrise_equation
Measurement of an electronic circuit
In electronic systems, power supply rejection ratio (PSRR), also supply-voltage rejection ratio (kSVR; SVR), is a term widely used to describe the capability
Power_supply_rejection_ratio
Algorithm for estimating the difference in free energy between two systems
The Bennett acceptance ratio method (BAR) is an algorithm for estimating the difference in free energy between two systems (usually the systems will be
Bennett_acceptance_ratio
Type of network that changes over time
{\displaystyle {\frac {4+\delta +\delta ^{2}}{2-\delta -\delta ^{2}}}} It may be noticed that the δ {\displaystyle \delta } ratio is the only parameter of
Local World Evolving Network Models
Local_World_Evolving_Network_Models
this expected value are indicative of other processes that affect the delta ratio of radiocarbon, namely radioactive decay. This deviation can be converted
Environmental_isotopes
Definition of the mass-action ratio, as used in chemistry
{\displaystyle \Delta _{\mathrm {r} }G_{T,p}=-RT\ln K_{eq}+RT\ln \Gamma } Substituting the mass-action ratio by the disequilibrium ratio times the equilibrium
Mass–action_ratio
1988 aviation accident in Texas
by engine pressure ratio (EPR), and while Delta owned Boeing 727s that had an EPR-activated TOWS, these were all aircraft that Delta had acquired from
Delta_Air_Lines_Flight_1141
Mathematical constants related to chaotic behavior
/ˈfaɪɡənbaʊm/ δ and α are two mathematical constants which both express ratios in a bifurcation diagram for a non-linear map. They are named after the
Feigenbaum_constants
American full-size car (1949–1999)
front bench seat. The standard engine in the base Delta 88 was a 350 cu in, low compression ratio (9.0:1) Rocket V8 with a Rochester two-barrel carburetor
Oldsmobile_88
Type of orbital maneuver
bi-elliptic transfers require a lower amount of total delta-v than a Hohmann transfer when the ratio of final to initial semi-major axis is 11.94 or greater
Bi-elliptic_transfer
Function's sensitivity to argument change
yielding a ratio with zero in the denominator, hence infinite relative change. More directly, given a small change Δ x {\displaystyle \Delta x} in x {\displaystyle
Condition_number
Probability distribution
A ratio distribution (also known as a quotient distribution) is a probability distribution constructed as the distribution of the ratio of random variables
Ratio_distribution
Amount of energy transferred or converted per unit time
d W d t . {\displaystyle P=\lim _{\Delta t\to 0}P_{\mathrm {avg} }=\lim _{\Delta t\to 0}{\frac {\Delta W}{\Delta t}}={\frac {dW}{dt}}.} When power P
Power_(physics)
Ratio in automotive engineering
motorcycles, delta tricycles and bicycles, the steering ratio is always 1:1, because the steering wheel is fixed to the front wheel. A steering ratio of x:y
Steering_ratio
Criterion for the convergence of a series
In mathematical analysis, the ratio test is a test (or "criterion") for the convergence of a series ∑ n = 1 ∞ a n , {\displaystyle \sum _{n=1}^{\infty
Ratio_test
Measure used in radio engineering and telecommunications
OIB-1 and OIB-3". www.deltaelectronics.com. Delta Electronics, Inc. Wolff, Christian. "Standing wave ratio". radartutorial.eu. Gridley, J.H. (2014). Principles
Standing_wave_ratio
Expected change in price of a stock relative to the whole market
\operatorname {Var} (r_{p})=(1-\delta )^{2}\operatorname {Var} (r_{m})+2\delta (1-\delta )\operatorname {Cov} (r_{m},r_{i})+\delta ^{2}\operatorname {Var} (r_{i})
Beta_(finance)
Ratio of shear stress to shear strain
_{xy}}}={\frac {\frac {F}{A}}{\frac {\Delta x}{l}}}={\frac {Fl}{A\Delta x}}\\\tau _{xy}&={\frac {F}{A}}\\\gamma _{xy}&={\frac {\Delta x}{l}}\end{aligned}}} where
Shear_modulus
Ratio of distance on a map to the corresponding distance on the ground
The scale of a map is the ratio of a distance on the map to the corresponding distance on the ground. This simple concept is complicated by the curvature
Scale_(map)
All-weather interceptor aircraft
The Convair F-106 Delta Dart is an all-weather interceptor aircraft designed and produced by the American aircraft manufacturer Convair, a division of
Convair_F-106_Delta_Dart
Signal conversion technique
↗ or ↘ state of the previous sample. To achieve high signal-to-noise ratio, delta modulation must use oversampling techniques, that is, the analog signal
Delta_modulation
Ability of magnetization
{\displaystyle \mu ={\frac {B_{0}}{H_{0}}}\cos(\delta )-j{\frac {B_{0}}{H_{0}}}\sin(\delta )=\mu '-j\mu ''.} The ratio of the imaginary to the real part of the
Permeability (electromagnetism)
Permeability_(electromagnetism)
Measure of the ratio of stable isotopes nitrogen-15 and nitrogen-14
palaeoclimatology, and palaeoceanography, δ15N (pronounced "delta fifteen n") or delta-N-15 is a measure of the ratio of the two stable isotopes of nitrogen, 15N:14N
Δ15N
Ratio used in material engineering
{\displaystyle \delta } is phase lag between stress and strain. The stress relaxation modulus G ( t ) {\displaystyle G\left(t\right)} is the ratio of the stress
Dynamic_modulus
Electronic method of transmitting information with a carrier wave
approximately 2 f Δ {\displaystyle 2f_{\Delta }\,} . While wideband FM uses more bandwidth, it can improve the signal-to-noise ratio significantly; for example, doubling
Frequency_modulation
Cold War interceptor of the US Air Force
The Convair F-102 Delta Dagger is an interceptor aircraft designed and produced by the American aircraft manufacturer Convair. A member of the Century
Convair_F-102_Delta_Dagger
Mathematical term
the two points is the difference ratio: m = Δ y Δ x = y 2 − y 1 x 2 − x 1 . {\displaystyle m={\frac {\Delta y}{\Delta x}}={\frac {y_{2}-y_{1}}{x_{2}-x_{1}}}
Slope
Physical constant
In physics, the proton-to-electron mass ratio (symbol μ or β) is the rest mass of the proton (a baryon found in atoms) divided by that of the electron
Proton-to-electron_mass_ratio
Calculation for the size of a fatigue crack
dN}=C\left(\Delta K\right)^{m}.} In 1967, Forman proposed the following relation to account for the increased growth rates due to stress ratio and when approaching
Crack_growth_equation
Number, approximately 2.20557
name supersilver ratio is by analogy with the silver ratio, the positive solution of the equation x2 = 2x + 1, and the supergolden ratio. Three quantities
Supersilver_ratio
discharge or efflux coefficient) is the ratio of the actual discharge to the ideal discharge, i.e., the ratio of the mass flow rate at the discharge end
Discharge_coefficient
Hydrogen-oxygen rocket engine for the Delta IV
the goal of producing a simpler, less costly, heavy-lift engine for the Delta IV launch system. Two versions of the engine have been produced: the original
RS-68
Term in mathematical optimization
{\displaystyle \Delta f_{\text{actual}}=f(x)-f(x+\Delta x).} By looking at the ratio Δ f pred / Δ f actual {\displaystyle \Delta f_{\text{pred}}/\Delta f_{\text{actual}}}
Trust_region
Technique of radiometric dating
measurement. The ratios D ∗ D r e f {\displaystyle {\frac {\mathrm {D*} }{\mathrm {D} _{ref}}}} or D 0 + Δ P t D r e f {\displaystyle D_{0}+\Delta {P}_{t} \over
Isochron_dating
One-off Soviet 1930s experimental aircraft
low-aspect-ratio delta wing. As early as 1933, Aleksandr Moskalyev was designing a rocket-powered, tailless aircraft with a highly-swept short-span curved delta
Moskalyev_SAM-9_Strela
Range of usable frequencies
{\displaystyle \%B_{\mathrm {F} }=100{\frac {\Delta f}{f_{\mathrm {C} }}}\,.} Ratio bandwidth is defined as the ratio of the upper and lower limits of the band
Bandwidth_(signal_processing)
Calculation commonly applied to engines and mobile power sources
Power-to-weight ratio (PWR, also called specific power, or power-to-mass ratio) is a calculation commonly applied to engines and mobile power sources to
Power-to-weight_ratio
Valve design
the ratio of pressure drops for identical flow rates: D i = ( Δ p r Δ p f ) Q , {\displaystyle \mathrm {Di} =\left({\frac {\Delta p_{\rm {r}}}{\Delta p_{\rm
Tesla_valve
Rocket engine
pressure-fed rocket engine used to propel the upper stage of the Delta rocket, referred to as Delta-P, from 1972 to 1988. The rocket engine uses Aerozine 50 as
TR-201
generalized Rachev ratio over the traditional Rachev ratio is conferred by the power indexes γ {\displaystyle \gamma } and δ {\displaystyle \delta } that characterize
Rachev_ratio
Number, approximately 2.41421
the silver ratio is a geometrical proportion with exact value 1 + √2, the positive solution of the equation x2 = 2x + 1. The name silver ratio is by analogy
Silver_ratio
Ratio of useful heating or cooling provided to work required
CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of the useful heating or cooling provided to the work (energy) required
Coefficient_of_performance
Ratio of kinematic viscosity to thermal diffusivity
ratio of the thermal to momentum boundary layer thickness is well approximated by δ t δ = P r − 1 3 , 0.6 ≤ P r ≤ 50 , {\displaystyle {\frac {\delta _{t}}{\delta
Prandtl_number
Mode of flight
{L \over D}={{\Delta s} \over {\Delta h}}={v_{\text{forward}} \over v_{\text{down}}}} Glide number (ε) is the reciprocal of glide ratio but sometime it
Gliding_flight
Calculation of relative masses of reactants and products in chemical reactions
products, so the relationship between reactants and products must form a ratio of positive integers. This means that if the amounts of the separate reactants
Stoichiometry
Degree to which part of a structural element is displaced under a given load
the δ x {\displaystyle \delta _{x}} and ϕ x {\displaystyle \phi _{x}} equations are identical to the δ B {\displaystyle \delta _{B}} and ϕ B {\displaystyle
Deflection_(engineering)
Most common type of rocket, used to launch satellites
The delta v required to reach low Earth orbit (or the required velocity of a sufficiently heavy suborbital payload) requires a wet to dry mass ratio larger
Multistage_rocket
Star in the constellation Pavo
notation gives the logarithm of the iron-to-hydrogen ratio, relative to that of the Sun, meaning that Delta Pavonis's iron abundance is 235% of that of Sun
Delta_Pavonis
Product of the Boltzmann constant and temperature
with energy E is proportional to e − Δ E k T . {\displaystyle e^{\frac {-\Delta E}{kT}}.} More fundamentally, kT is the amount of heat required to increase
KT_(energy)
Vehicle propelled by ejection of gases
a mass ratio of about 10, and achieved a specific impulse of 263 seconds. This gives a delta-v of around 5.9 km/s whereas around 9.4 km/s delta-v is needed
Rocket
Proportion of income which is saved
economics, the average propensity to save (APS), also known as the savings ratio, is the proportion of income which is saved, usually expressed for household
Average_propensity_to_save
Metric that quantifies induced consumption
{MPC}}={\frac {\Delta C}{\Delta Y}}} , where Δ C {\displaystyle \Delta C} is the change in consumption, and Δ Y {\displaystyle \Delta Y} is the change
Marginal propensity to consume
Marginal_propensity_to_consume
Signal processing technique
resolution when pulse length is constrained or increase the signal to noise ratio when the peak power and the bandwidth (or equivalently range resolution)
Pulse_compression
Technique in radio direction finding
converting this ratio to a deviation angle using the relationships: ψ Δ = ψ S − ψ = 4 N a r c t a n ( Δ ψ Σ ψ ) {\displaystyle \psi _{\Delta }=\psi _{S}-\psi
Phase-comparison_monopulse
Measure of the deviation in the ratio of stable isotopes oxygen-18 and oxygen-16
geochemistry, paleoclimatology and paleoceanography δ18O or delta-O-18 is a measure of the deviation in ratio of stable isotopes oxygen-18 (18O) and oxygen-16 (16O)
Δ18O
Point to which functions converge in analysis
that he used a rigorous epsilon-delta definition in proofs. In 1861, Karl Weierstrass first introduced the epsilon-delta definition of limit in the form
Limit_of_a_function
The Lippisch Delta VI was a proposed single-seat, twin-jet experimental delta flying wing aircraft begun in 1943 by German designer Alexander Lippisch
Lippisch_Delta_VI
length, there are various methods in use to measure coastlines through ratios and other metrics.[citation needed] A coastline of zero indicates that the
List of countries and dependencies by length of coastline
List_of_countries_and_dependencies_by_length_of_coastline
Device to couple energy between circuits
transformer, with voltage ratio and winding turns ratio both being inversely proportional to the corresponding current ratio. The load impedance referred
Transformer
Number, approximately 3.14
combined into the fraction π δ {\displaystyle {\tfrac {\pi }{\delta }}} for denoting the ratios semiperimeter to semidiameter and perimeter to diameter,
Pi
1950s British supersonic research aircraft
The Fairey Delta 2 or FD2 (internal designation Type V within Fairey) is a British supersonic research aircraft that was produced by the Fairey Aviation
Fairey_Delta_2
DELTA RATIO
DELTA RATIO
Girl/Female
Indian
A name of Goddess Lakshmi
Girl/Female
German American English Greek
Bright. Noble.
Girl/Female
Tamil
Nagamma | நாகமமாஂÂ
Nag devta, Song, Tune or a melody
Nagamma | நாகமமாஂÂ
Boy/Male
Hindu
Indra devta
Girl/Female
Welsh American Celtic German Greek
Dark.
Boy/Male
Hawaiian
The Lord is my God.
Female
English
Short form of English Fidelma, possibly DELMA means "hospitable."
Girl/Female
German American Spanish
Noble protector.
Girl/Female
American, Australian, Celtic, Chinese, Christian, French, German, Spanish
Noble Protector; Of the Sea
Girl/Female
Hindu
Nag devta, Song, Tune or a melody
Girl/Female
American, Australian, British, Christian, English, German, Latin
Noble; Of Nobility; Small Winged One; Heart; Delight
Boy/Male
Tamil
Inder Kant | இநà¯à®¤à®°à®•ாநà¯à®¤
Indra devta
Inder Kant | இநà¯à®¤à®°à®•ாநà¯à®¤
Female
English
(Δήλια) Greek name DELIA means "of Delos." In mythology, this is a name borne by Artemis, referring to her place of birth.
Girl/Female
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
A Name for Goddess Lakshmi
Girl/Female
Hindu, Indian, Punjabi, Sikh
Divine Damsel
Girl/Female
Greek American
Born fourth. Fourth letter of the Greek alphabet.
Girl/Female
American, Australian, Christian, Greek, Hebrew
Triangular River Mouth; Mouth of a River; Fourth Letter of Greek Alphabet; A Name for a Fourth Child; Fourth Letter of the Greek Alphabet
Girl/Female
American, Australian, British, Chinese, Christian, Danish, English, Finnish, French, German, Greek, Italian, Latin, Portuguese, Romanian, Swedish
Of Delos; Visible; Heart; People-bold; Delightful; Faithful
Male
Egyptian
, a ram deity; and, a town in the Delta.
Female
English
Feminine form of English Dell, DELLA means "lives in a dell/hollow."
DELTA RATIO
DELTA RATIO
DELTA RATIO
DELTA RATIO
DELTA RATIO
DELTA RATIO
DELTA RATIO