Hi
I'm not a statistical person and have no idea what standard deviation is or could possibly achieve but if you create a comptuted column and look at the functions tab there are STD functions listed.
as an example
columns
A b c d e f g h
2 4 4 4 5 5 7 9
using the STD unction
STD(a,b,c,d,e,f,g,h) = 2.1380899353
Hopefully this is right and if not I'm sure I'll hear about it
derek