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David Arenburg

Rating
1732.38 (66th) 		Reputation
80,581 (1,024th)
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Title Δ
Does R transform() overwrite each value? 0.00
How to pass all columns except one as argument to setkey()? 0.00
R Dataframe comparison which, scaling bad 0.00
populate a new column in a df with new values +0.32
5 minutes interval time to 15 minutes time interval mean data -1.36
changing values in vector given a location and condition with R -0.36
Summarizing category values within a nested list in R 0.00
Number of specific column values in consecutive rows of dataframe i... +0.32
How to split a string variable in variables in R (non-rectangular) -0.09
Extracting specific rows of grouped items conditionally in R 0.00
Select the second observation per group in R +0.05
Transposing Complex data.frame in R -0.26
Remove rows from a data frame that contain duplicate information ac... +0.99
Convert a number to HH:MM:SS -1.10
position of first and last non-dot in a string with regex -1.39
Convert multiple binary columns to single categorical column +1.95
How to remove columns based on colSum 0.00
Create a function +0.32
Make another column based using some values in other column -0.34
r: complete value in missing date -1.63
Calculate sum of a column by ID based on the value of another colum... +0.84
How to split character and numerical separately in R -2.13
How do I use an ifelse within a loop in R? +0.94
R Split data.frame using a column that represents and on/off switch +1.44
Creating variables from factor records in R +0.32
Merge function with several key repetitions on the "right-cros... -0.18
How to replace NAs with the linear interpolation between known obse... -2.09
Why does **0.5 appear to be more efficient than sqrt() -1.47
How to replace a specific word in dataframe -0.06
R: Convert hours:minutes:seconds +1.06
R-splitting a data frame into equal parts and composing a list +1.64
R data samples counting 0.00
R-ranking values of a column by grouping, conditional to another va... -0.07
Place on specific positions of dataframes specific values -0.62
data.table operation with .SD: calculating percentage change concis... 0.00
Get categories from numeric vector +1.04
Converting the value of a Column in R +0.32
R package constructing time objects from date and hour(integer) -1.55
Complex random sampling procedure needed in R (multiple grouping an... 0.00
dplyr: Find date for which an event occurs -0.44
R apply function to data based on index column value 0.00
Is the "*apply" family really not vectorized? -1.88
How to count standard deviation of a vector in R without an element? +0.32
Removing parentheses as unwanted text in R using gsub +0.32
Column means for several columns 0.00
R delete non max values in redundant rows +0.07
Copy column from another data frame to based on row names from a di... +0.33
Delete rows after a certain sequence of values in a certain column -0.04
How to flatten/merge overlapping time periods in R 0.00
data.table: how to filter lines with %in% when not all variables ar... +1.29