CNF2STD

Purpose:

Converts a confidence level (%) to a standard deviation range.

CNF2STD(alpha)

alpha

A real or series. The confidence level(s) in %. Defaults to, 99, a 99% confidence level.

A real or series. The standard deviation range for the given confidence level.

cnf2std(99)

returns 2.5758, the standard deviation range for a confidence level of 99%.

W1: {99, 98, 97, 96, 95}

W2: cnf2std(w1)

W2 == {2.5758, 2.3263, 2.1701, 2.0537, 1.9600}

the standard deviation ranges for confidence levels 99%, 98%, 97%, 96%, and 95%.

CNF2STD uses the built-in INVPROBN function to lookup a z value for a given probability.