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MichaelChirico

Julia, R, Python, QGIS, SAGA, STATA, MATLAB neophyte.

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Top Questions
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96
What does .SD stand for in data.table in R
stackoverflow.com

94
What to do about students who miss my lectures and then want me to repeat entire material?
academia.stackexchange.com

83
V.I. Arnold says Russian students can't solve this problem, but American students can — why?
math.stackexchange.com

78
In a right triangle, can $a+b=c?$
math.stackexchange.com

69
Speeding up the performance of write.table
stackoverflow.com

57
Use of lapply .SD in data.table R
stackoverflow.com

50
Read SAS sas7bdat data into R
stackoverflow.com

38
Is the sum of two white noise processes necessarily a white noise?
stats.stackexchange.com

33
Faster way to read fixed-width files
stackoverflow.com

29
Did close to 3,000 Puerto Ricans die in Hurricane Maria?
skeptics.stackexchange.com

27
Find the value of a function whose derivative is zero
math.stackexchange.com

27
How do people perform mental arithmetic for complicated expressions?
math.stackexchange.com

26
R: how to check whether a vector is ascending/descending
stackoverflow.com

25
Why does it take more time for data.table::fread to read a file when filename is specified differently?
stackoverflow.com

25
Read an Excel file directly from a R script
stackoverflow.com

21
Lower case for a (factor) data frame column
stackoverflow.com

19
The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or dataframe
stackoverflow.com

19
How can I view the source code for a function?
stackoverflow.com

19
How to quickly form groups (quartiles, deciles, etc) by ordering column(s) in a data frame
stackoverflow.com

16
Replace values in a dataframe based on lookup table
stackoverflow.com

15
Converted xxx-eps-converted-to.pdf not found
tex.stackexchange.com

15
Select first and last row from grouped data
stackoverflow.com

14
Most efficient way of exporting large (3.9 mill obs) data.frames to text file?
stackoverflow.com

14
Draw lines between all the coordinates in a plot
stackoverflow.com

13
What is the difference between extraction via $ and @ in R?
stackoverflow.com

12
What do . (dot) and % (percentage) mean in R?
stackoverflow.com

12
Merging a large number of files from one directory into a data frame in R
stackoverflow.com

12
Are differences between uniformly distributed numbers uniformly distributed?
stats.stackexchange.com

12
R: By group, test if for each value of one variable, that value exists in another variable
stackoverflow.com

12
data.table: performance of binary search VS vector scan
stackoverflow.com

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