KPG1_HSSTP

Calculates statistics from an histogram

Description:

This routine calculates certain statistical parameters for an histogram. The median is derived by linear interpolation within an histogram bin. The mode is estimated from 3∗median - 2∗mean, which is only valid for moderately skew distributions.

Invocation

CALL KPG1_HSSTP( NUMBIN, HIST, VALMAX, VALMIN, SUM, MEAN, MEDIAN, MODE, STATUS )

Arguments

NUMBIN = INTEGER (Given)
Number of bins in the histogram.
HIST( NUMBIN ) = INTEGER (Given)
The histogram whose statistics are to be derived.
VALMAX = DOUBLE PRECISION (Given)
Maximum data value included in the histogram.
VALMIN = DOUBLE PRECISION (Given)
Minimum data value included in the histogram.
SUM = DOUBLE PRECISION (Returned)
Sum of all values in the histogram.
MEAN = DOUBLE PRECISION (Returned)
Mean of the histogram.
MEDIAN = DOUBLE PRECISION (Returned)
Median of the histogram.
MODE = DOUBLE PRECISION (Returned)
Mode of the histogram. The bad value (VAL__BADD) is returned if the calculated mode lies outside the data range of the histogram.
STATUS = INTEGER (Given)
Global status value.

References

Moroney, M.J., 1957, " Facts from Figures" (Pelican) Goad, L.E. 1980, in " Applications of Digital Image Processing to Astronomy" , SPIE 264, 139.