FRIEDMAN Subcommand (NPAR TESTS command)

NPAR TESTS FRIEDMAN=varlist

FRIEDMAN tests whether k related samples have been drawn from the same population. The output shows the mean rank for each variable in the Friedman Ranks table and the number of valid cases, chi-square, degrees of freedom, and probability in the Test Statistics table.

Syntax

• The minimum specification is a list of two variables.
• Variables should be at least at the ordinal level of measurement.

Operations

• The values of k variables are ranked from 1 to k for each case, and the mean rank is calculated for each variable over all cases.
• The test statistic has approximately a chi-square distribution. A single test statistic is calculated, comparing all variables.

Example

NPAR TESTS FRIEDMAN=V1 V2 V3
  /STATISTICS=DESCRIPTIVES.

• This example tests variables V1, V2, and V3, and the example requests univariate statistics for all three variables.