Christoph_J

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Christoph_J has asked 41 questions and find answers to 17 problems.

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Christoph_J questions

How to match two data.frames with an inexact matching identifier (one identifier has to be in the range of the other)
Create vector of random numbers (size of vector not known at run-time)
Error message running the example from the reshape2 help page
How to simulate an AR(1) process with arima.sim and an estimated model?
How to return input values from callModule function in shiny
Is there an efficient way to parallelize mapply?
How to best join one column of a data.table with another column of the same data.table?
Why does mapply not return date-objects?
Using Dates with the data.table package
Why does dmy() in the lubridate package not work with NAs? What is a good workaround?

Christoph_J answers

How would you translate this into data.table package language in R?
Calculating days per month between interval of two dates
How can I subset the negation of a key value using R's data.table package?
Displaying <<..>>= in output
Panel data regression: Robust standard errors
Row wise matrix operations in R
faster way to create variable that aggregates a column by id [duplicate]
data.table efficient alternative to grouped assignment as DT[ ,x:=f(y),by=z]?
R data.table grouping for lagged regression
How do I rename a data-frame in a for-loop