NAME:
	moment4
 PURPOSE: (one line)
	Compute various statistical moments of the data.
 DESCRIPTION:
	This routine computes the average, average deviation, standard
	deviation, variance, skew and kurtosis of the input data.  The various
	output quantities are always returned as floating point scalars.
	The statistics are compute with no regard for the dimensionality of
	the input data.
 CATEGORY:
	Statistics
 CALLING SEQUENCE:
	moment4,data,avg,avgdev,stddev,var,skew,kurt
 INPUTS:
	data - Input data to be analyzed.
 OPTIONAL INPUT PARAMETERS:
	None.
 KEYWORD PARAMETERS:
	None.
 OUTPUTS:
	avg    - Sample mean.
	avgdev - Average deviation of the data from the mean.
	stddev - Standard deviation of the data from the mean.
	var    - Variance of the data from the mean.
	skew   - Skewness, third statistical moment.
	kurt   - Kurtosis, fourth statistical moment.
 COMMON BLOCKS:
	None.
 SIDE EFFECTS:
	None.
 RESTRICTIONS:
	None.
 PROCEDURE:

 MODIFICATION HISTORY:
	Written by Marc W. Buie, Lowell Observatory, 1992 Jan 20
  1997/09/06, MWB, changed name from moment to avoid name conflict.
  2000/11/2, MWB, modified to use the IDL system function moment.  This
     routine really does nothing more than rewrap the IDL function.