Common Notation :: SAS/STAT(R) 12.3 User's Guide

Table 99.5 displays notation for some of the commonly used symbols.

Table 99.5: Common Notation

Symbol	Description
$\mu$	Population value of (arithmetic) mean
$\mu _0$	Null value of test (value of H0= option in PROC TTEST statement)
$\sigma ^2$	Population variance
$\sigma$	Population value of standard deviation
$\gamma$	Population value of geometric mean
$\mr {CV}$	Population value of coefficient of variation (ratio of population standard deviation and population arithmetic mean)
$\alpha$	Value of ALPHA= option in PROC TTEST statement
$t_{p, \nu }$	pth percentile of t distribution with $\nu$ degrees of freedom (df)
$F_{p, \nu _1, \nu _2}$	pth percentile of F distribution with $\nu _1$ numerator df and $\nu _2$ denominator df
$\chi ^2_{p, \nu }$	pth percentile of chi-square distribution with $\nu$ df

The TTEST Procedure