Summary functions
These functions calculate scalar summaries of values in any numerical structure:
Arithmetic sum
Synonym for SUM
Average
Median value
Minimum value
Maximum value
Range of values
Correlation
Covariance
Standard deviation
Standard error of the mean
Skewness
Kurtosis
Variance
Number of values
Synonym of NVALUES
number of values ignoring restrictions (i.e. full
length)
Number of observations (non-missing values)
Number of missing values
These functions provide percentiles, quartiles and ranks of the values in any numerical structure:
Percentiles
Quantiles
Ranks
These functions provide summaries of running sequences of values in a variate:
Running means
Number of observations contributing to the computation
of a running mean or total about each unit
Running totals
Length of run of identical values up to each unit
This function gives the number of levels in a factor:
Number of levels of a factor
These functions evaluate areas:
Estimates the area under a curve
Area of a polygon
These function indicate whether or not a dummy structure has been set:
Returns 1 if a dummy is set, otherwise 0
Returns 1 if a dummy is unset, otherwise 0