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Frank

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1617.40 (1,172nd) 		Reputation
57,070 (1,677th)
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Title Δ
How to count the number of two observations binary combinations? +0.96
Optimizing replacement in a data frame +0.78
How to order a data.table in R based on multiple columns with ties? 0.00
How to update constant values on specific rows by group? -0.03
Creating a new r data.table column based on values in another colum... +0.33
R: data.table compare sets of rows -1.89
R - Identify a sequence of row elements by groups in a dataframe -1.74
Check if data.table query returns empty result set 0.00
R collapse multiple rows into 1 row - same columns -1.78
Simplify this grid such that each row and column has 1 value +0.08
Generate a table of values for several columns -0.18
Removing all rows under a specified row in a time series +0.27
Remove group of rows by flag indicator in R +1.45
R 3.3.2 Error importing CSV using read.table -- Probable quoting is... +1.41
Subsetting and assigning data in R 0.00
Aggregate a data.table rolling join 0.00
R data.table upsert operation +0.35
How to save one graph in two destination files? -2.63
Identify records where a given sequence of events happens within x... +0.33
Add missing subtotals to each group using dplyr -2.27
data.table aggregate by group and keep corresponding values from ot... 0.00
Dynamically passing a variable to the `i` expression in data.table 0.00
How to find column index for top n values of a matrix efficiently? 0.00
Unexpected result using data.table's shift() by group (bug?) 0.00
Elegant way to identify runs inside a data.table +0.31
R: aggregate in data.table and reuse variable 0.00
data.table filter list column for empty values 0.00
How can I find the indices of a continuous string of numbers? +0.88
Can different parts of dplyr::summarize() be computed conditionally? -0.12
How to overload function parameters in R? -0.73
R: ifelse assignment in data.table 0.00
Create data.frame for each connection between identifier in vector... 0.00
Find next date in series by group +1.55
What's the R equivalent of Stata's _n function? -0.59
obtain row count of subset from data table +0.42
R - stratified sampling for Person Period file -2.01
R data.table by group replace first row of all missing column +1.91
How to create a function that multiplies until reaching a total? +0.90
replace NA value in unmatched rows after joining data.table in R 0.00
Count how many times a vector/row matches data frame +1.55
Nested if statements - R -0.20
dplyr, data.table and setDT interaction issue 0.00
R ifelse changed factor value into index 0.00
Selecting factors based upon distance between two rows in a column 0.00
Groupby in R to fill a new table and while changing row names 0.00
Cumulative Sum of a division with varying denominators R +0.81
Subset a sparse-matrix with data.table in R +0.37
keep specific duplicate based on lookup table in R +1.41
Sum by on the fly factor over many columns +1.19
Sum the values of groups of 4 contiguous columns in R +1.62