Categorical Analysis

Hi,

I had a query related to categorical data analysis,

As in case of numeric data we have mean and covariance. How does this
map to categorical data. Does categorical data have a mean ( or it is
really the mode) and what in case of covariance.

I presume these definition apply to even catergorical data, so if there
is a huge dataset with categorical data in it , how should we go about
calculating the mean(mode) for categorical data and the covariance of
the data.

For numeric data as there are standard forumales to do that.

Thanks in advance,
Kalyan

.

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