std Error Of Difference
The standard error for the pair of data names given by the strings. If the data names don't exist or the difference "
$s1 - $
s2" or "$s2 - $
s1" does not exist then an exception will occur. The standard error of the differences are symmetric. That is standard error of "$s1 - $
s2" is equal to the standard error of "$s2 - $
s1".Return
standard error for the pair of data names given by the strings "
$s1 - $
s2" or "$s2 - $
s1"Parameters
s1
the name of data set number 1
s2
the name of data set number 2