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MichaelChirico

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

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Top Questions
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107
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

87
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

73
Speeding up the performance of write.table
stackoverflow.com

63
Use of lapply .SD in data.table R
stackoverflow.com

51
Read SAS sas7bdat data into R
stackoverflow.com

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

38
Faster way to read fixed-width files
stackoverflow.com

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

29
R: how to check whether a vector is ascending/descending
stackoverflow.com

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

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

25
Converted xxx-eps-converted-to.pdf not found
tex.stackexchange.com

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

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

22
How to quickly form groups (quartiles, deciles, etc) by ordering column(s) in a data frame
stackoverflow.com

22
The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or dataframe
stackoverflow.com

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

20
How can I view the source code for a function?
stackoverflow.com

19
Replace values in a dataframe based on lookup table
stackoverflow.com

16
Select first and last row from grouped data
stackoverflow.com

16
Most efficient way of exporting large (3.9 mill obs) data.frames to text file?
stackoverflow.com

15
reshape wide to long using data.table with multiple columns
stackoverflow.com

14
What is the difference between extraction via $ and @ in R?
stackoverflow.com

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

14
Elegant way to check for missing packages and install them?
stackoverflow.com

13
What do . (dot) and % (percentage) mean in R?
stackoverflow.com

13
R: By group, test if for each value of one variable, that value exists in another variable
stackoverflow.com

12
How can I tell which packages I am not using in my R script?
stackoverflow.com

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