Re: Box car counts by RR  NMRA Charles collection
Tim O'Connor
Larry
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I suspect Tim would have recommended computing the standard deviation of this data set, in order to see how closely these observed differences from the mean values match the expected standard deviation. One does not "expect" all values in a sample data set from a large population to match the mean values, but one does expect that the mean of the deviations is predictable. If it is, then you can make a case that your data set is a good representation of a hypothetical sample. If not, then the data set may be skewed, or your expected sample may be incorrect (i.e. Tim's theory of distribution may be incorrect). http://en.wikipedia.org/wiki/Standard_deviation Tim O'Connor
I just posted a table in the files section file that compares expected

