i think you are asking the wrong question ... because, as far as i know ... there is only really one standard deviation concept ... square root of the variance (average of squared deviations around the mean in a set of data) ...
perhaps what you are really interested in is HOW should VARIABILITY be measured in your context? perhaps the variance (ie, standard deviation) is not what you are after ... _________________________________________________________ dennis roberts, educational psychology, penn state university 208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED] http://roberts.ed.psu.edu/users/droberts/drober~1.htm ================================================================= Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =================================================================
