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jangorecki

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Top Questions
Top Answers
63
How to join (merge) data frames (inner, outer, left, right)
stackoverflow.com

31
Grouping functions (tapply, by, aggregate) and the *apply family
stackoverflow.com

21
Adaptive moving average - top performance in R
stackoverflow.com

21
R install packages from Shell
stackoverflow.com

18
R xts and data.table
stackoverflow.com

17
data.table merge by multiple columns
stackoverflow.com

16
Manipulation of Large Files in R
stackoverflow.com

15
How to avoid warning when introducing NAs by coercion
stackoverflow.com

14
R: data.table cross-join not working
stackoverflow.com

13
Reorder rows in data.table in a specific order
stackoverflow.com

11
Aggregating sub totals and grand totals with data.table
stackoverflow.com

9
R data.table join: SQL “select *” alike syntax in joined tables?
stackoverflow.com

9
Calculating moving average
stackoverflow.com

9
Replace NAs with mean of the same column of a data.table
stackoverflow.com

9
Subset data table without using <-
stackoverflow.com

8
Efficiently counting non-NA elements in data.table
stackoverflow.com

8
Subsetting data.table columns using []
stackoverflow.com

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?
stackoverflow.com

7
How to do non-equi join with variable column name
stackoverflow.com

7
How to order data within subgroups in data.table R
stackoverflow.com

7
SQL's `case when …` code conversion using data.table package in R
stackoverflow.com

7
Drop factor levels in a subsetted data frame
stackoverflow.com

6
Rolling Sum by Another Variable in R
stackoverflow.com

6
data.table join with roll = “nearest” returns “search value” instead of original value
stackoverflow.com

6
Is pandas now faster than data.table?
datascience.stackexchange.com

5
Dynamically build call for lookup multiple columns
stackoverflow.com

5
Improve rolling mean usage in data.table
stackoverflow.com

5
How can I change XTS to data.frame and keep Index?
stackoverflow.com

5
Error in data table: Item has no length? - R
stackoverflow.com

5
How do I use arguments of a function when using sapply?
stackoverflow.com

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