Programmer Guide/SPU Reference/EXSTAT: Difference between revisions
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Revision as of 17:31, 18 November 2010
Contents
EXSTAT - calculation of statistical moments
Usage:
EXSTAT X PX TYP
Inputs:
| X | data vector (default: 0 .. N-1) |
| PX | probability vector (default: 1..1) |
| TYP | 0 ... central moments |
| 1 ... "spectral moments" |
Outputs:
| M1 | first moment (mean value) (number) |
| M2 | second moment (variance) (number) |
| M3 | third moment (number) |
| M4 | fourth moment (number) |
| N | length of X and PX (number) |
Function:
Compute the statistical moments of the inputs.
File:1222.png first moment
File:1223.png k-th moment
If TYP = 1 then the results are normalized as follows:
File:1224.png (spectral) spread
File:1225.png (Fisher) skewness
File:1226.png (Pearson) kurtosis
If both inputs are set to default values, calculation is stopped and an error is returned.
