R

Here are two related questions but they are not duplicates of mine as the first one has a solution specific to the data set and the second one involves a failure of glm when start is supplied alongside an offset. https://stackoverflow.com/questions/31342637/error-please-supply-starting-valueshttps://stackoverflow.com/questions/8212063/r-glm-starting-values-not-accepted-log-link I have the following dataset: such that dt is: I am trying to fit … Read more

The error is because of the trailing + after geom_point(). Remove that and it should work.

I tried to merge two data.frames, and they are like below: AND They both have 1,048,575 rows. My code is merge(a,b,by=c(“GVKEY”,”YEAR”)), I kept receiving error message “negative length vectors are not allowed“. I also tried the data.table way, but got error message saying that my results would exceed 2^31 rows. Apparently, the merged data will … Read more

use lapply to work with and return lists. It’s better to use %in% because == will fail on missing values.

The R Language Definition is handy for answering these types of questions: http://cran.r-project.org/doc/manuals/R-lang.html#Indexing R has three basic indexing operators, with syntax displayed by the following examples For vectors and matrices the [[ forms are rarely used, although they have some slight semantic differences from the [ form (e.g. it drops any names or dimnames attribute, … Read more

See ?merge: the name “row.names” or the number 0 specifies the row names. Example:

If you have many columns to convert to numeric Another option is to use stringsAsFactors=FALSE while reading the file using read.table or read.csv Just in case, other options to create/change columns or

I had everything working with R and RStudio, but then I moved the folders when cleaning up my computer directories & files. Now I’m getting the error message below. Should R and RStudio be installed under Program Files or Program Files (x86)? Should I have two libPaths?

You can easily make lists of lists mylist is now a list that contains two lists. To access list1 you can use mylist[[1]]. If you want to be able to something like mylist$list1 then you need to do somethingl like Edit: To reply to your edit. Just use double bracket indexing

Any ggplots side-by-side (or n plots on a grid) The function grid.arrange() in the gridExtra package will combine multiple plots; this is how you put two side by side. This is useful when the two plots are not based on the same data, for example if you want to plot different variables without using reshape(). … Read more