<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial,helvetica,sans-serif;font-size:12pt"><div>I made an error in my post where I defined the stddev in terms of count, sum and sum of squares. This is minor but worth correcting. stdev(m)=sqrt(sum(m*m)/count(m) - sum(m)*sum(m)/count(m)/count(m))<br><br>Michael<br></div></div><br>
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