I would like to learn how to count the amount of records associated with a variable. I have a real big dataset which has 2 types of users (casual & member), I want to know the total amount of rides a type of user asked for the service.
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1Include data as a text and not image – Onyambu Jul 24 '22 at 04:31
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Does this answer your question? [Count number of rows within each group](https://stackoverflow.com/questions/9809166/count-number-of-rows-within-each-group) – user438383 Jul 25 '22 at 11:55
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Here's an example with the iris dataset and data.table package.
library(data.table)
DT <- as.data.table(iris)
DT[, .(count = .N), by = Species]
parmsam
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