StackRating

An Elo-based rating system for Stack Overflow
Home   |   About   |   Stats and Analysis   |   Get a Badge
Rating Stats for

David Arenburg

Rating
1732.38 (66th) 		Reputation
80,581 (1,024th)
Page: 1 ... 5 6 7 8 9 ... 33
Title Δ
Merge 2 columns in dataframe by prioritize one of them in R +1.28
Create a vector in a dataframe based on matching a second vector to... +1.23
Removing multiple variables with dplyr 0.00
Perform function on String of Numbers in Data Frame -1.82
how to do mean made up of sum of few variables in R +0.23
In R, split a dataframe so subset dataframes contain last row of pr... -0.90
Build column of data frame with character vectors of different leng... 0.00
How to get print function output into a dataframe +0.62
Selecting a sequence of random length starting and ending with spec... 0.00
How to create ID (by) before merging in R? 0.00
Concatenate individual genomic intervals into populational regions +1.03
Calculating percentage scores acros observations +0.21
Subset/filter data.table by 2 paired vectors 0.00
Apply custom function to specific row/column 0.00
Aggregate sum and mean in R with ddply +0.23
Alter values in one data frame based on comparison values in anothe... +0.20
Number of non-NA records by column, grouped -0.51
How to calculate the number of value between two extreme values? +1.09
What's the best way to multiply each column of a matrix to a ve... -0.25
reshape data and coerce missing to zero -0.50
Convert all variables to factors keeping level NA 0.00
Counting frequency using plyr +0.94
Operation within a column by group +1.37
Aggregate across a list of dataframes 0.00
Choose a month of a year to rank then give resulting ranks to the r... +0.20
How to subset a matrix with different column positions for each row? -2.67
sort the strings based on last word in r 0.00
How to count the number of items in a subset group of an array that... +1.01
Create this vector using rep() and seq() -2.46
R: Compare data.table and pass variable while respecting key 0.00
Summary of multiple factored columns 0.00
GREP: Find the locations where 2 words co-exist in a list of strings +0.77
Divide data.table rows by overall mean -0.28
Removing NAs from data frame columns. Different length of columns a... +0.22
Applying a function to every combination of two columns in a datafr... 0.00
Change labels from numeric to numeric 0.00
How to rollapply over a multi column data table -1.05
Summarize datatable by group based on nrows of other column 0.00
Data.table: Join on ID and Date key, but want closest date before (... 0.00
R data.table rolling join "mult" not working as expected 0.00
dplyr idiom for "select A, B, max(C) from D group by C" +1.23
R data table: compare row value to group values, with condition +1.54
How to change date format(d.m.Y) to year(Y) & find annual cumul... -0.62
Data manipulations +1.39
Remove NAs from each variable (column) and combine cases -0.90
Convert integers to decimal values +1.71
How to apply function to QoQ Data 0.00
dplyr: difference between values measured at same location, differe... 0.00
Detect numeric vector elements that are within a certain distance f... +1.22
R regex - match until first letter-space-digit combination from the... -1.72