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a=(a_{n})_{n\in \mathbb {N} },} the first difference of a is Δ a . {\displaystyle \Delta a.} The second difference is Δ 2 a = ( Δ ∘ Δ ) a = Δ ( Δ a ) ...

In statistics and econometrics, the first-difference (FD) estimator is an estimator used to address the problem of omitted variables with panel data. It...

Difference in differences (DID or DD) is a statistical technique used in econometrics and quantitative research in the social sciences that attempts to...

A difference engine is an automatic mechanical calculator designed to tabulate polynomial functions. It was designed in the 1820s, and was first created...

Voltage, also known as (electrical) potential difference, electric pressure, or electric tension is the difference in electric potential between two points...

finite difference is a mathematical expression of the form f (x + b) − f (x + a). If a finite difference is divided by b − a, one gets a difference quotient...

contains both the levels and the first difference equations. It provides an alternative to the standard first difference GMM estimator. Unlike static panel...

from the data through differencing, for example by subtracting the group-level average over time, or by taking a first difference which will remove any...

In finance, a contract for difference (CFD) is a legally binding agreement that creates, defines, and governs mutual rights and obligations between two...

In color science, color difference or color distance is the separation between two colors. This metric allows quantified examination of a notion that formerly...

"father of the computer". He is credited with inventing the first mechanical computer, the Difference Engine, that eventually led to more complex electronic...

less than one—then the first difference of the process will be stationary; otherwise, the process will need to be differenced multiple times to become...

Difference and Repetition (French: Différence et répétition) is a 1968 book by French philosopher Gilles Deleuze. Originally published in France, it was...

In any quantitative science, the terms relative change and relative difference are used to compare two quantities while taking into account the "sizes"...

In mathematics, the symmetric difference of two sets, also known as the disjunctive union and set sum, is the set of elements which are in either of the...

finite-difference methods (FDM) are a class of numerical techniques for solving differential equations by approximating derivatives with finite differences....

irreconcilable differences were the original and only grounds for no-fault divorce, such as in California, which enacted America's first purely no-fault...

The Difference Engine (1990) is an alternative history novel by William Gibson and Bruce Sterling. It is widely regarded as a book that helped establish...

In imaging science, difference of Gaussians (DoG) is a feature enhancement algorithm that involves the subtraction of one Gaussian blurred version of an...

Finite-difference time-domain (FDTD) or Yee's method (named after the Chinese American applied mathematician Kane S. Yee, born 1934) is a numerical analysis...