"Dr. S. Shapiro" wrote: > > Dear Colleagues; > > I am familiar with calculation of an arithmetic mean > +/- a standard deviation. However, for certain problems > now I need to calculate a geometric mean rather than an > arithmetic mean. Is the "standard" standard deviation > still valid for use with the geometric mean, or does a > different kind of standard deviation need to be used in > conjunction with the geometric mean? > > Please write to me _directly_ at > > [EMAIL PROTECTED] > > Thanks in advance to all responders, > > S. Shapiro > [EMAIL PROTECTED]
The geometric SD is the anti-log of the SD of the logs. Confidence intervals are constructed by multiplying and dividing by powers of the geometric SD rather than by adding and subtracting multiples. . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
