In experiments on pea breeding,
Mendel observed the different kinds of seeds obtained by crosses between
round yellow seeds and wrinkled green seeds.
Possible types of progeny were:
``round yellow'', ``wrinkled yellow'', ``round green'', and
We call the data categorical
when the recorded data
take values on several types, or categories.
Then the frequency of a particular value (or type)
is observed in the categorical data,
and the probability of such occurrence
is called the population proportion
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