In mean.default(X, ...) : argument is not numeric or logical: returning NA

General
,
1

I am trying to calculate the index of dispersion of a data set but anytime I input the code
IndexOfDispersion(horsekicks), It shows
Warning message: In mean.default(X, ...) : argument is not numeric or logical: returning NA
What can I do?

2

I suspect that horsekicks is not numeric. What do you get from running

str(horsekicks)

Also, where does the IndexOfDispersion function come from?

3

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4

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