Syntax
Purpose
STATS_WSR_TEST
is a Wilcoxon Signed Ranks test of paired samples to determine whether the median of the differences between the samples is significantly different from zero. The absolute values of the differences are ordered and assigned ranks. Then the null hypothesis states that the sum of the ranks of the positive differences is equal to the sum of the ranks of the negative differences.
This function takes two required arguments: expr1
and expr2
are the two samples being analyzed. The optional third argument lets you specify the meaning of the NUMBER
value returned by this function, as shown in Table 710. For this argument, you can specify a text literal, or a bind variable or expression that evaluates to a constant character value. If you omit the third argument, then the default is 'TWO_SIDED_SIG'
.
Table 710 STATS_WSR_TEST_* Return Values
Argument  Return Value Meaning 


The observed value of Z 

Onetailed significance of Z 

Twotailed significance of Z 
Onesided significance is always with respect to the upper tail. The high value (the value whose rejection region is the upper tail) is expr1
.