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Method of data analysis
Principal component analysis (PCA) is a linear dimensionality reduction technique with applications in exploratory data analysis, visualization and data
Principal_component_analysis
Statistical method for analysing climate data
Directional component analysis (DCA) is a statistical method used in climate science for identifying representative patterns of variability in space-time
Directional component analysis
Directional_component_analysis
Topics referred to by the same term
amplifier Direct coupling analysis, a method for analyzing sequence data in computational biology Directional component analysis, a multivariate statistical
DCA
Set of different models of the climate system
analyze climate ensembles, such as Principal component analysis, Anova and Directional component analysis. Ensemble forecasting Ensemble (fluid mechanics)
Climate_ensemble
Ssimulation environment for fluid and mechatronic systems
and vehicle dynamics. It uses bi-directional delay lines (or transmission line elements) to connect different components. The development on Hopsan first
Hopsan
Relative location of objects in space
a Directional relations can again be differentiated into external directional relations and internal directional relations. An internal directional relation
Spatial_relation
Techniques to study geometric data
(Principal Component Analysis), the Chi-Square distance (Correspondence Analysis) or the Generalized Mahalanobis distance (Discriminant Analysis) are among
Spatial_analysis
Security analysis methodology
In finance, technical analysis is an analysis methodology for analysing and forecasting the direction of prices through the study of past market data
Technical_analysis
Cosines of the angles between a vector and the coordinate axes
In analytic geometry, the direction cosines (or directional cosines) of a vector are the cosines of the angles between the vector and the three positive
Direction_cosine
Multivariate derivative (mathematics)
gradient is the rate of increase in that direction, the greatest absolute directional derivative. Further, a point where the gradient is the zero vector is
Gradient
Measure of distance between two proportions
{\displaystyle h=\varphi _{1}-\varphi _{2}.} This is also sometimes called "directional h" because, in addition to showing the magnitude of the difference, it
Cohen's_h
Transmission line-based electrical circuit
Circuits built from these components include filters, power dividers, directional couplers, and circulators. Distributed-element circuits were studied
Distributed-element_circuit
Study of uncertainty in the output of a mathematical model or system
parameter space. By utilizing the concepts of directional variograms and covariograms, variogram analysis of response surfaces (VARS) addresses this weakness
Sensitivity_analysis
Mathematical concept applicable to physics
scalar quantity, defined as the surface integral of the perpendicular component of a vector field over a surface. The word flux comes from Latin: fluxus
Flux
Type of machine that uses liquid fluid power to perform work
compensators in the directional valves. Hydraulically controlled LS pump. Load sensing with up-stream compensator for each connected directional valve. Hydraulically
Hydraulic_machinery
Fundamental construction of differential calculus
derivative makes a choice for taking directional derivatives of vector fields along curves. This extends the directional derivative of scalar functions to
Generalizations of the derivative
Generalizations_of_the_derivative
Directional variation in strength of radio waves
antenna radiation pattern (or antenna pattern or far-field pattern) is the directional (angular) dependence of the field strength (sometimes also the phase)
Radiation_pattern
Aircraft component
movable control surfaces, that provides longitudinal (pitch) and/or directional (yaw) stability and control. A stabilizer can feature a fixed or adjustable
Stabilizer_(aeronautics)
Type of derivative in mathematics
f=r\cos \theta \sin \theta } .) Even the existence and linearity of all directional derivatives at a point is not sufficient for differentiability; the essential
Derivative (multivariable calculus)
Derivative_(multivariable_calculus)
Forensic method
have had little impact on the use of bloodstain analysis in courts. Blood is composed of three components suspended in plasma: erythrocytes (red blood cells)
Bloodstain_pattern_analysis
Electronic filter that is constructed with waveguide technology
than to filter signals. Such devices include impedance matching components, directional couplers, and diplexers. These devices frequently take on the form
Waveguide_filter
Tool for digital signal processing
filter bank is called analysis (meaning analysis of the signal in terms of its components in each sub-band); the output of analysis is referred to as a
Filter_bank
American company specializing in audio equipment
corporate literature, AudioQuest claims that their Ethernet cables are directional. This is a claim that goes against the Ethernet standard IEEE 802.3.
AudioQuest
Checking software against expectations
malfunction. Software may lack proper support for reading or writing bi-directional text. Software may display images with text that was not localized. Localized
Software_testing
Specification of a derivative along a tangent vector of a manifold
system "keeping it parallel" amounts to keeping the components constant. This ordinary directional derivative on Euclidean space is the first example of
Covariant_derivative
Localized dielectric breakdown under high voltage stress
antenna mounted on insulating spacers in the surrounding metalwork. Directional Coupler detection picks up the signals emanating from a partial discharge
Partial_discharge
Vector operator in vector calculus
or component, so x2 refers to the second component, and not the quantity x squared. The index variable i is used to refer to an arbitrary component, such
Divergence
Proposed parameter in linguistics
In linguistics, head directionality is a proposed parameter that classifies languages according to whether they are head-initial (the head of a phrase
Head-directionality_parameter
Probability distribution on a hyper-sphere of arbitrary dimension
In directional statistics, the von Mises–Fisher distribution (named after Richard von Mises and Ronald Fisher), is a probability distribution on the (
Von_Mises–Fisher_distribution
or "bugs", tiny, hidden microphone and short-range radio transmitter Directional microphones Smart glasses, and other wearable technologies Primarily
Surveillance_tools
principles and applications of Multirate filter banks and Multidimensional Directional filter banks. Linear time-invariant systems typically operate at a single
Multirate filter bank and multidimensional directional filter banks
Multirate_filter_bank_and_multidimensional_directional_filter_banks
Circulation density in a vector field
through its components along various axes passing through the point: if u ^ {\displaystyle \mathbf {\hat {u}} } is any unit vector, the component of the curl
Curl_(mathematics)
Device that transmits and receives radio waves
preferentially in a particular direction (directional, or high-gain, or "beam" antennas). An antenna may include components not connected to the transmitter,
Antenna_(radio)
Formula in calculus
total derivative, which is a linear transformation that captures all directional derivatives in a single formula. Consider differentiable functions f :
Chain_rule
Topics referred to by the same term
tree-like carbonized patterns (electrical treeing) appear on an insulator Directional stability, the tendency of a vehicle (typically referring to a watercraft)
Tracking
Derivative of a function with multiple variables
fact, the last equality shows that the partial derivative is just the directional derivative where the direction is the i {\displaystyle i} -th standard
Partial_derivative
Certain vector fields are the sum of an irrotational and a solenoidal vector field
the curl-free component of a vector field as the longitudinal component and the divergence-free component as the transverse component. This terminology
Helmholtz_decomposition
Mathematical notion of infinitesimal difference
that x j ( p ) {\displaystyle x_{j}(p)} is the j {\displaystyle j} -th component of p ∈ R n {\displaystyle p\in \mathbb {R} ^{n}} ). Then the differentials
Differential_(mathematics)
Matrix of partial derivatives of a vector-valued function
matrix is square, that is, if the number of variables equals the number of components of function values, then its determinant is called the Jacobian determinant
Jacobian matrix and determinant
Jacobian_matrix_and_determinant
Statistical measure of the magnitude of a phenomenon
is referred to as estimation statistics. Effect size is an essential component in the evaluation of the strength of a statistical claim, and it is the
Effect_size
Integration over a non-flat region in 3D space
along S, that is, if v has both a tangential and a normal component, then only the normal component contributes to the flux. Based on this reasoning, to find
Surface_integral
Partial least squares — statistical techniques similar to principal components analysis Non-linear iterative partial least squares (NIPLS) Mathematical programming
List of numerical analysis topics
List_of_numerical_analysis_topics
Academic field
exists a path from any node to any other, ignoring directionality of the edges. Strongly Connected Component: A collection of nodes in which there exists a
Network_science
Physical quantity in radiometry
transmitted component of the radiosity of the surface For an opaque surface, the transmitted component of radiosity Je,tr vanishes and only two components remain:
Radiosity_(radiometry)
Science of air vehicle orientation and control in three dimensions
stick free static longitudinal stability, static lateral stability, directional stability, oscillatory stability, and spiral stability. An aircraft in
Aircraft_flight_dynamics
Aircraft motion combining rolling and yawing
aircraft design, Dutch roll results from relatively weaker positive directional stability as opposed to positive lateral stability. When an aircraft
Dutch_roll
Mathematical signal manipulation by computers
magnitude of each frequency component squared. The most common purpose for analysis of signals in the frequency domain is analysis of signal properties. The
Digital_signal_processing
Algebraic object with geometric applications
contravariant components, which are known as tensor fields in the modern sense. In the 20th century, the subject came to be known as tensor analysis. It achieved
Tensor
signal analysis. With further analysis it is seen that these complex wavelets are oriented. This sort of orientation helps to resolve the directional ambiguity
Wavelet for multidimensional signals analysis
Wavelet_for_multidimensional_signals_analysis
Genomic analysis technique
(A) and inactive (B) chromatin compartments is based on principal component analysis, first established by Lieberman-Aiden et al. in 2009. Their approach
Hi-C (genomic analysis technique)
Hi-C_(genomic_analysis_technique)
Matrix of second derivatives
of as an array of m {\displaystyle m} Hessian matrices, one for each component of f {\displaystyle \mathbf {f} } : H ( f ) = ( H ( f 1 ) , H ( f 2 )
Hessian_matrix
Rule based DFM analysis for direct metal laser sintering. Direct metal laser sintering (DMLS) is one type of additive manufacturing process that allows
Rule-based DFM analysis for direct metal laser sintering
Rule-based_DFM_analysis_for_direct_metal_laser_sintering
Statistical term
to any form of multiple regression analysis, factor analysis, canonical correlation analysis, discriminant analysis, as well as more general families of
Path_analysis_(statistics)
Mathematical identities
)\mathbf {T} } where A ⋅ ∇ {\displaystyle \mathbf {A} \cdot \nabla } is the directional derivative in the direction of A {\displaystyle \mathbf {A} } multiplied
Vector_calculus_identities
ANCOVA – redirects to Analysis of covariance Anderson–Darling test ANOVA ANOVA on ranks ANOVA–simultaneous component analysis Anomaly detection Anomaly
List_of_statistics_articles
Quantifying the behaviour of loudspeakers
transducers, have a higher level of distortion than other audio system components used in playback or sound reinforcement. One way to test a loudspeaker
Loudspeaker_measurement
Experimental 1980s USAF aircraft
control system to help stabilize the aircraft about its longitudinal and directional axes. The aircraft made its first successful flight on February 5, 1982
Northrop_Tacit_Blue
Convention of symbols representing language
rightward order, as all horizontal scripts sequence rows from top to bottom Directionality How individual lines are read – whether starting from the left or right
Writing_system
FOPIDs. Fractional-order integrators and differentiators are the main component of FOPIDs. The differintegral operator, a D t q ( f ( x ) ) {\displaystyle
Fractional-order_integrator
Difference in wind speed or direction over a short distance
spreading out near ground level from the parent thunderstorm, both speed and directional wind shear can result at the leading edge of the three-dimensional boundary
Wind_shear
Point to which functions converge in analysis
mathematics, the limit of a function is a fundamental concept in calculus and analysis concerning the behavior of that function near a particular input which
Limit_of_a_function
Signal processing technique
structures. Recent progress on this problem involves using an iteratively directional TV refinement for CS reconstruction. This method would have 2 stages:
Compressed_sensing
Study of signs
tool for structural analysis. It explores how the meanings of linguistic and non-linguistic texts are shaped by their components and what roles specific
Semiotics
Electric charge generated in certain solids due to mechanical stress
extraction of lead-free piezoceramic components has not grown to a significant scale at this time, but from early analysis, experts encourage caution when
Piezoelectricity
Military exercise of authority by a commanding officer over assigned forces
staff are a group of officers and enlisted personnel that provides a bi-directional flow of information between a commanding officer and subordinate military
Command_and_control
Generalization of the one-dimensional normal distribution to higher dimensions
be k-variate normally distributed if every linear combination of its k components has a univariate normal distribution. Its importance derives mainly from
Multivariate normal distribution
Multivariate_normal_distribution
Folding of DNA to create two- and three-dimensional shapes at the nanoscale
creating dynamic DNA origami machines exist, such as designing a directional component and using brownian motion to drive rotational movement of structures
DNA_origami
Infinitesimal calculus on functions defined on a geometric algebra
{\displaystyle F} be a multivector-valued function of a vector. The directional derivative of F {\displaystyle F} along b {\displaystyle b} at a {\displaystyle
Geometric_calculus
Theorem in vector calculus
{\displaystyle \gamma } divides R 2 {\displaystyle \mathbb {R} ^{2}} into two components, a compact one and another that is non-compact. Let D {\displaystyle D}
Stokes'_theorem
Branch of mathematics
all possess natural analogues in Riemannian geometry. The notion of a directional derivative of a function from multivariable calculus is extended to the
Differential_geometry
Community of living organisms together with the nonliving components of their environment
organisms in interaction with their environment, where the biotic and abiotic components are linked together through nutrient cycles and energy flows. Ecosystems
Ecosystem
finite mean and variance, will be approximately normally distributed. Directional statistics is the subdiscipline of statistics that deals with directions
Central limit theorem for directional statistics
Central_limit_theorem_for_directional_statistics
Branch of mathematics
Haldane, F. D. M.; Raghu, S. (10 January 2008). "Possible Realization of Directional Optical Waveguides in Photonic Crystals with Broken Time-Reversal Symmetry"
Topology
Lower bound on the quality factor of small radio antennae
ISBN 978-0521895842. Chu, L. J. (December 1948). "Physical limitations of omni-directional antennas" (PDF). Journal of Applied Physics. 19 (12): 1163–1175. Bibcode:1948JAP
Chu–Harrington_limit
Depicting depth with levels of darkness
amount of ambient light it can reflect. This produces diffused, non-directional lighting throughout the scene, casting no clear shadows, but with enclosed
Shading
Maximum energy available for use
diffuse component generally varies with frequency, being highest in the ultraviolet region. The dependence of the exergy content on directional distribution
Exergy
components analysis (PCA)—split into PC1 (measuring variation within all dogs sampled) and PC2 (measuring variation within Chernobyl). The analysis of
Dogs in the Chernobyl exclusion zone
Dogs_in_the_Chernobyl_exclusion_zone
condensate production CONDE – condensate analysis report CONDR – continuous directional log CORAN – core analysis report CORE – core report CORG – corgun[check
List of abbreviations in oil and gas exploration and production
List_of_abbreviations_in_oil_and_gas_exploration_and_production
Graphical representation of the "flow" of data through an information system
information (material). The arrow shows the flow direction (it can also be bi-directional if the information to/from the entity is logically dependent—e.g. question
Data-flow_diagram
of a complicated function can be found by differentiating its simpler component functions, integration does not, so tables of known integrals are often
Lists_of_integrals
Hybrid species of bee
behaviors between different species of honey bees are the result of a directional selection that acts upon several foraging behavior traits as a common
Africanized_bee
American government official (born 1970)
1970) was the Under Secretary of Homeland Security for Intelligence and Analysis from January 2017 to May 2020 and is currently the president and CEO of
David_Glawe
Vector calculus formulas relating the bulk with the boundary of a region
\partial \mathbf {n} }\right)\,dS.} In the equation above, ∂φ/∂n is the directional derivative of φ in the direction of the outward pointing surface normal
Green's_identities
Tensor related to gradients
component of the tensor, which lacks any directional information (containing an identity matrix E {\displaystyle E} ). To know how much directional information
Structure_tensor
Method of statistical inference
and are the basis of the Neyman–Pearson lemma. One-tailed directional. A one-tailed directional alternative hypothesis is concerned with the region of rejection
Statistical_hypothesis_test
Procedure used in oil well drilling
Measurement while drilling (MWD) refers to directional-drilling measurements (e.g., for decision support for the wellbore path). Initial attempts to provide
Measurement_while_drilling
Pipe stress analysis software
module (ROHR2stoss) allows the analysis of dynamic events in the time domain, while taking into account non-linear components such as snubbers or visco dampers
ROHR2
Home video game console
as a modular home computer with the Master Component priced at US$165 and a soon-to-follow Keyboard Component also at $165 (equivalent to $730 in 2025)
Intellivision
Statement relating differentiable symmetries to conserved quantities
\mathbf {p} \right)=\mathbf {n} \cdot \mathbf {L} .} In other words, the component of the angular momentum L along the n axis is conserved. And if n is arbitrary
Noether's_theorem
Differential operator in mathematics
components of the vector field A {\displaystyle \mathbf {A} } , and ∇ 2 {\displaystyle \nabla ^{2}} just on the left of each vector field component is
Laplace_operator
Study of evolutionary relationships between organisms
tree. An unrooted tree diagram (a network) makes no assumption about directionality of character state transformation, and does not show the origin or "root"
Phylogenetics
Theorem in mathematics
In mathematical analysis, the inverse function theorem gives sufficient conditions for a function to have an inverse function. The essential idea is that
Inverse_function_theorem
Statistical model comparing multiple variables over time
at two or more different time points. This model aims to estimate the directional effects that one variable has on another at different points in time
Cross-lagged_panel_model
Type of beamforming network
made to simultaneously produce an omnidirectional beam and multiple directional beams when fed through two Butler matrices back-to-back. Butler matrices
Butler_matrix
progress in upscaling was slow, and it was not until 1990-2000 that directional dependency of relative permeability and need for tensor representation
Darcy's law for multiphase flow
Darcy's_law_for_multiphase_flow
Educational programs combining academic and technical skills for workforce preparation
itamae, and cook. Telecommunications technician – tower technician, directional boring, fiber-optic/coaxial, utility pole technician, satellite dish
Career and technical education
Career_and_technical_education
Evaluates a line integral through a gradient field using the original scalar field
path-independent. Let v be any nonzero vector in Rn. By the definition of the directional derivative, ∂ f ( x ) ∂ v = lim t → 0 f ( x + t v ) − f ( x ) t = lim
Gradient_theorem
Measure used in radio engineering and telecommunications
frequencies. At lower frequencies, such lines are impractically long. Directional couplers can be used at HF through microwave frequencies. Some are a
Standing_wave_ratio
Fast-moving current of hot gas and volcanic matter that moves away from a volcano
The denser components of pyroclastic currents are what is specifically meant when referring to pyroclastic flow, whereas the lighter components of pyroclastic
Pyroclastic_flow
Tensor index notation for tensor-based calculations
century. The basis of modern tensor analysis was developed by Bernhard Riemann in a paper from 1861. A component of a tensor is a real number that is
Ricci_calculus
DIRECTIONAL COMPONENT-ANALYSIS
DIRECTIONAL COMPONENT-ANALYSIS
DIRECTIONAL COMPONENT-ANALYSIS
DIRECTIONAL COMPONENT-ANALYSIS
DIRECTIONAL COMPONENT-ANALYSIS
DIRECTIONAL COMPONENT-ANALYSIS
DIRECTIONAL COMPONENT-ANALYSIS
DIRECTIONAL COMPONENT-ANALYSIS
DIRECTIONAL COMPONENT-ANALYSIS