Frequency distribution, Advanced Statistics

The division of a sample of observations into several classes, together with the number of observations in each of them.  It acts as a useful summary of the main features of the data like shape, location and spread. It is essentially the empirical equivalent of probability distribution. An example can be given as follows.

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It is used generally for the matrix which specifies a statistical model for a set of observations. For instance, in a one-way design with the three observations in one group, tw