Business / Taxes / Correlation: In investment terms, correlation is the extent to which the values of different types of investments move in tandem with one another in response to changing economic and market conditions. Correlation is measured on a scale of -1 to +1. Investments with a correlation of +.5 or more tend to rise and fall in value at the same time. Investments with a negative correlation of -.5 to -1 are more likely to gain or lose value in opposing cycles.

Autocorrelation Function (ACF)

Science / Spiders / Autocorrelation Function (ACF): the cross-correlation function of an image with itself. The ACF is centrosymmetric, and its highest peak is always in the origin, a shift position where both signal and noise contents of the image ove MORE


Business / Finance / Autocorrelation: The correlation of a variable with itself over successive time intervals. Sometimes called serial correlation. MORE

Fourier Shell Correlation (FSC)

Science / Spiders / Fourier Shell Correlation (FSC): same as Fourier ring correlation, except that values of the discrete Fourier transforms are compared within corresponding shells, instead of rings [van Heel, 1987b. MORE