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MichaelChirico

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

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Top Questions
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117
What does .SD stand for in data.table in R
stackoverflow.com

99
What to do about students who miss my lectures and then want me to repeat entire material?
academia.stackexchange.com

96
V.I. Arnold says Russian students can't solve this problem, but American students can -- why?
math.stackexchange.com

81
In a right triangle, can $a+b=c?$
math.stackexchange.com

77
Speeding up the performance of write.table
stackoverflow.com

71
Use of lapply .SD in data.table R
stackoverflow.com

56
Read SAS sas7bdat data into R
stackoverflow.com

41
Faster way to read fixed-width files
stackoverflow.com

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

34
Check whether a vector is ascending/descending order
stackoverflow.com

33
Converted xxx-eps-converted-to.pdf not found
tex.stackexchange.com

33
Elegant way to check for missing packages and install them?
stackoverflow.com

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

27
How to quickly form groups (quartiles, deciles, etc) by ordering column(s) in a data frame
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

26
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

24
The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or dataframe
stackoverflow.com

22
How can I view the source code for a function?
stackoverflow.com

21
Replace values in a dataframe based on lookup table
stackoverflow.com

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

20
reshape wide to long using data.table with multiple columns
stackoverflow.com

18
Most efficient way of exporting large (3.9 mill obs) data.frames to text file?
stackoverflow.com

18
Select first and last row from grouped data
stackoverflow.com

16
How can I tell which packages I am not using in my R script?
stackoverflow.com

15
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
R: By group, test if for each value of one variable, that value exists in another variable
stackoverflow.com

14
How to prevent truncation of error messages in R
stackoverflow.com

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