count number of rows in a data frame in r based on group

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Numbering Rows within Groups of Data Frame in R (2 Examples) | Base R vs. dplyr | Add Group Counter Numbering Rows within Groups of Data Frame in R (2 Examples) | Base R vs. dplyr | Add Group Counter
R : count number of rows in a data frame in R based on group R : count number of rows in a data frame in R based on group
Count Number of Rows by Group Using dplyr Package in R (Example) | group_by, summarise & n Functions Count Number of Rows by Group Using dplyr Package in R (Example) | group_by, summarise & n Functions
Count Non-NA Values by Group in R (2 Examples) | Base R & dplyr | group_by() & summarize() Functions Count Non-NA Values by Group in R (2 Examples) | Base R & dplyr | group_by() & summarize() Functions
Count NA Values by Group in R (2 Examples) | Base R & dplyr Package | group_by & summarize Functions Count NA Values by Group in R (2 Examples) | Base R & dplyr Package | group_by & summarize Functions
Count Rows by Group in pandas DataFrame in Python (Examples) | Number of Cases | groupby() & size() Count Rows by Group in pandas DataFrame in Python (Examples) | Number of Cases | groupby() & size()
Count Number of Cases in Each Group of Data Frame in R (Example) | nrow, aggregate & length Function Count Number of Cases in Each Group of Data Frame in R (Example) | nrow, aggregate & length Function
Count Number of Rows in a Dataframe that Match Dynamic Conditions Count Number of Rows in a Dataframe that Match Dynamic Conditions