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Data.table
2019/03/25
count number of observations in grouping
2019/03/25
rowSums specific columns in dataframe
2019/03/23
Using melt and dcast in data.table
2019/02/28
Keep only complete rows with no NA values
2019/02/28
Remove rows with all NA
2019/02/28
Split a data.table into a list by row number
2019/02/28
Test if all values in column are NA