StackRating

An Elo-based rating system for Stack Overflow

Home | About | Stats and Analysis | Get a Badge

Rating Stats for

Jaap

Rating
1662.99 (393rd)

Reputation
58,717 (1,592nd)

Page: 1 2 3 4 5 6 ... 23

Title	Δ
Create dummy-column based on another columns	-0.32
Repeat columns on a table according to name	+0.61
Compare rows in groups in the same data frame	+1.30
Counting groups with shared elements	-0.93
Find the duration of overlap between pairs of timestamps using data...	-0.89
Calculate formula over all rows and specific columns of dataframe	+1.56
Using cut() with group_by()	+0.03
Quick way to count number of position match of a given character be...	-1.36
How to build a link between a character table and a numeric table?	0.00
ggplot2: color individual words in title	-2.38
Create new vector based on conditions from another vector	+0.65
Match records immediately before and after time range	+0.69
Summing of lookups in other data.table too slow	+1.10
Insert new rows in dataframe with conditions	+1.03
data.table: calculate statistics of rows time within time moving wi...	-0.23
Dynamics "rollapply" in R	+0.54
Import text file separated by new line	0.00
Identifying related records and assigning them unique IDs / data cl...	-0.18
Calculate the percent occurrence of a variable in multiple groups	-2.29
How to collapse all character vectors in a list	0.00
How to get the means of all columns but one?	+0.72
Use apply to replace multiple values in a dataframe	+0.50
How to add rows in-between other data frames in the following way	-1.39
data.table: count rows within time moving window	0.00
get(columnname) vs [[columnname]] in data.table	0.00
How to take the first two values but not equal to a specific value...	+0.83
Why is summary() produced from data.table output not printing to fi...	+0.29
How to get the values with maximum occurrence across range of colum...	+1.18
How to dennote duplicate values based on multiple criteria within a...	+0.08
Tidy conditional replacement	-2.00
Convert day of year to date assuming all years are non-leap years	0.00
Extract string within data.table	-0.23
For each column, sum scores by group over prior window of time	0.00
Reshaping basket data frame for separating items in a basket	+1.70
Make data frame with ratios of every column against every other	-0.87
Sequential generation of columns based on multiple existing columns	+0.77
Extract specific elements of a list column to new columns	-0.36
Differences to earlier instance within group or external variable	+1.84
Filtering rows based on two columns and a running id	0.00
data.table fread error - gzip file - set temporary directory	+1.22
How to calculate time difference in consecutive rows	+0.68
Creating new column in data frame with condition on nonempty cells	-0.53
Cumsum reset at certain values	+0.26
Sum up cells by some columns	+1.59
Introduce NA in a value text exist into two columns	+0.70
t.test with multiple group variables and multiple scale variable	+1.06
Creating multiple new summarizing columns in data.table	0.00
How to calculate row medians efficiently with data.table	0.00
Adding new columns based to existing columns 's modalites with...	+0.70
Return All Possible Combinations of Values	-1.95