% -*- texinfo -*- % @deftypefn {Function File} {[@var{pval}, @var{f}, @var{df_num}, @var{df_den}] =} var_test (@var{x}, @var{y}, @var{alt}) % For two samples @var{x} and @var{y} from normal distributions with % unknown means and unknown variances, perform an F-test of the null % hypothesis of equal variances. Under the null, the test statistic % @var{f} follows an F-distribution with @var{df_num} and @var{df_den} % degrees of freedom. % % With the optional argument string @var{alt}, the alternative of % interest can be selected. If @var{alt} is @code{'~='} or % @code{'<>'}, the null is tested against the two-sided alternative % @code{var (@var{x}) ~= var (@var{y})}. If @var{alt} is @code{'>'}, % the one-sided alternative @code{var (@var{x}) > var (@var{y})} is % used. Similarly for '<', the one-sided alternative @code{var % (@var{x}) > var (@var{y})} is used. The default is the two-sided % case. % % The p-value of the test is returned in @var{pval}. % % If no output argument is given, the p-value of the test is displayed. % @end deftypefn

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