"Dennis Roberts" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> >3[mean] - [median] / (std. dev.) > > but, look at this one? i read this as multiplying the mean by 3 first ... > then subtracting the ratio of the median divided by the sd ... let's say we > had a norm. dist. with mean = 100 and sd = 10 ... we know the median is > also 100 so ... > > 3(100) - (100/10) = 300 - 10 = 290 ... ????????? > > i don't think your latter formula is anywhere near correct > Couldn't you read my mind? Sorry for the confusion but what I should have written is: (3*mean - median)/std. dev. What you couldnt see is that tiny division bar under the entire numerator - it must be the cheap fonts you're using! From the discussion it sounds like the multiple formulas to calculate skewness are confusing to more than just me. We need the ISO to come in and give a name to every kind of skewness and then pass a law that we must name the formula when using it - or be shot. So thanks for the discussion, but it sounds like I could create a skewness formula sqrt(mean^2-median^2)/stnd. dev - call it Joe's formula for skewness, and get it published somewhere - even if its only on google. . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
