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SWIFT
SWIFTsim
Commits
2ebdff41
Commit
2ebdff41
authored
Feb 28, 2019
by
Folkert Nobels
Browse files
Add documentation to the pearson correlation function
parent
2e854b77
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tests/testRandom.c
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tests/testRandom.c
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2ebdff41
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@@ -26,6 +26,28 @@
/* Local headers. */
#include "swift.h"
/**
* @brief Compute the Pearson correlation coefficient for two sets of numbers
*
* The pearson correlation coefficient between two sets of numbers can be
* calculated as:
*
* <x*y> - <x>*<y>
* r_xy = ----------------------
* (var(x) * var(y))^.5
*
* In the case that both sets are purely uncorrelated the value of the
* Pearson correlation function is expected to be close to 0. In the case that
* there is positive correlation r_xy > 0 and in the case of negative
* correlation, the function has r_xy < 0.
*
* @param mean1 average of first series of numbers
* @param mean2 average of second series of numbers
* @param total12 sum of x_i * y_i of both series of numbers
* @param var1 variance of the first series of numbers
* @param var2 variance of the second series of numbers
* @param number of elements in both series
* */
double
pearsonfunc
(
double
mean1
,
double
mean2
,
double
total12
,
double
var1
,
double
var2
,
int
counter
)
{
const
double
mean12
=
total12
/
(
double
)
counter
;
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