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by() giving error when applying mean function over a data frame. What's happening?

r mean na

Count number of non-NA values by group

r na counting

Replace NA with last non-NA in data.table by using only data.table

r data.table na

NA filling only if "sandwiched" by the same value using dplyr

r dplyr na

Quick replace of NA - an error or warning

r dataframe na

In R, can I make the table() function return the number of NA values in a named element?

r na

Aggregate by NA in R

r aggregate na

Cannot use `fill = NA` in cast

r na

Converting Factor Levels to Numbers

r matrix na

How to subset data in R without losing NA rows?

r dataframe subset na

Remove trailing (last) rows with NAs in all columns

r data.table subset na missing-data

Insert NA values into dataframe blank cells when importing read.csv/read.xlsx

r excel na read.csv

Direct way of telling ifelse to ignore NA

r if-statement na

Multiple na.strings in read.table() function in R

r na read.table

Removing NA in correlation matrix

r variables matrix correlation na

R unique columns or rows incomparables with NA

r unique na

sparseIndexTracking 0.1.0 failure in if(): missing value where TRUE/FALSE needed

r xts na zoo

data.table 1.8.x mean() function auto removing NA?

r data.table mean na na.rm

Differences between vectors _including_ NA

r vector na

How to omit NA values while pasting numerous column values together?

r na
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