incomplete Animaldata dataset

functions such as mean/median/sd/hist cannot display Animaldata dataset fully
as shown in the attachment.

Note that when i was loading dataset, it gave a warning that the data set was created in different version of RStudio

Hi, welcome!

We don't really have enough info to help you out. Could you ask this with a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.

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Thanks

Solved. my code was wrong