In article <[EMAIL PROTECTED]>, Rich Ulrich <[EMAIL PROTECTED]> wrote: >On 22 Nov 2002 22:01:59 -0800, [EMAIL PROTECTED] (Jay Warner) wrote:
>[snip. including Example about counts and 'class intervals' ...] >> ... I have a mass for each class, an amount on a continuous >> scale, which I can also report as a percentage of the total. I can >> calculate an average and standard deviation for the entire histogram. >And what do you mean by 'standard deviation for the entire >histogram'? Either you have an error term for each bar of >the histogram, or you have nothing that is useful for testing >the bars. >> I can calculate an expected frequency for a theoretical distribution >> with the same average and standard deviation. I can report both >> observed and expected frequencies in percent of total, stick this into >> a Chi Square, and crunch the numbers. This does NOT have a chi-squared distribution. This has been known for a half century. Using anything other than the frequencies of the cells to estimate parameters does this. -- This address is for information only. I do not claim that these views are those of the Statistics Department or of Purdue University. Herman Rubin, Deptartment of Statistics, Purdue University [EMAIL PROTECTED] Phone: (765)494-6054 FAX: (765)494-0558 . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
