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68
How to join (merge) data frames (inner, outer, left, right)
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33
Grouping functions (tapply, by, aggregate) and the *apply family
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25
R install packages from Shell
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23
Adaptive moving average - top performance in R
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18
R xts and data.table
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18
How to avoid warning when introducing NAs by coercion
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17
data.table merge by multiple columns
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16
R: data.table cross-join not working
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16
Manipulation of Large Files in R
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14
Aggregating sub totals and grand totals with data.table
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13
Calculating moving average
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13
Reorder rows in data.table in a specific order
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11
How to order data within subgroups in data.table R
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11
Is pandas now faster than data.table?
datascience.stackexchange.com

10
Replace NAs with mean of the same column of a data.table
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9
Subset data table without using <-
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9
R data.table join: SQL “select *” alike syntax in joined tables?
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8
Is it possible to use the data.table index-join-assignment idiom to do a left join and assign NAs in the non-matching rows of i to x?
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8
Subsetting data.table columns using []
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8
Efficiently counting non-NA elements in data.table
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7
apply multiple functions in sapply
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7
SQL's `case when …` code conversion using data.table package in R
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7
Drop factor levels in a subsetted data frame
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7
How to do non-equi join with variable column name
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6
Improve rolling mean usage in data.table
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6
Changing column names of a data frame
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6
data.table join with roll = “nearest” returns “search value” instead of original value
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6
How can one work fully generically in data.table in R with column names in variables
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6
Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
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6
Rolling Sum by Another Variable in R
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