Blog Archives

Splitting a Dataset Revisited: Keeping Covariates Balanced Between Splits

March 8, 2011
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Splitting a Dataset Revisited: Keeping Covariates Balanced Between Splits

In my previous post I showed you how to randomly split up a dataset into training and testing datasets. (Thanks to all those who emailed me or left comments letting me know that this could be done using other means. As things go with R, it's sometimes ...

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RStudio: New free IDE for R

February 28, 2011
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Just saw the announcement of the availability of Rstudio, a new (free & open source) integrated development environment for R that works on Windows, Mac, and Linux. Judging from the screenshots, it looks like Rstudio supports syntax highlighting for Sweave & easy PDF creation from Sweave code, which is something I haven't seen anywhere else (on Windows at least)....

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RStudio: New free IDE for R

February 28, 2011
By

Just saw the announcement of the availability of Rstudio, a new (free & open source) integrated development environment for R that works on Windows, Mac, and Linux. Judging from the screenshots, it looks like Rstudio supports syntax highlighting for Sweave & easy PDF creation from Sweave code, which is something I haven't seen anywhere else (on Windows at least)....

Read more »

Split a Data Frame into Testing and Training Sets in R

February 24, 2011
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I recently analyzed some data trying to find a model that would explain body fat distribution as predicted by several blood biomarkers. I had more predictors than samples (p>n), and I didn't have a clue which variables, interactions, or quadratic terms made biological sense to put into a model. I then turned to a few data mining procedures that I...

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Split a Data Frame into Testing and Training Sets in R

February 24, 2011
By

I recently analyzed some data trying to find a model that would explain body fat distribution as predicted by several blood biomarkers. I had more predictors than samples (p>n), and I didn't have a clue which variables, interactions, or quadratic terms made biological sense to put into a model. I then turned to a few data mining procedures that I...

Read more »

Get all your Questions Answered

February 22, 2011
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When I have a question I usually ask the internet before bugging my neighbor. Yet it seems like Google's search results have become increasingly irrelevant over the last few years, and this is especially true for searching anything related to R (and pr...

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Get all your Questions Answered

February 22, 2011
By

When I have a question I usually ask the internet before bugging my neighbor. Yet it seems like Google's search results have become increasingly irrelevant over the last few years, and this is especially true for searching anything related to R (and pr...

Read more »

R: Given column name in a Data Frame, Get the Index

February 17, 2011
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Had a mental block today trying to figure out how to get the indices of columns in a data frame given their names. Simple task but difficult to search Google for an answer. Thanks to jashapiro, Matt, and Vince for giving me a heads up on the which() fu...

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R: Given column name in a Data Frame, Get the Index

February 17, 2011
By

Had a mental block today trying to figure out how to get the indices of columns in a data frame given their names. Simple task but difficult to search Google for an answer. Thanks to jashapiro, Matt, and Vince for giving me a heads up on the which() fu...

Read more »

Summarize Missing Data for all Variables in a Data Frame in R

February 16, 2011
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Something like this probably already exists in an R package somewhere out there, but I needed a function to summarize how much missing data I have in each variable of a data frame in R. Pass a data frame to this function and for each variable it'll give you the number of missing values, the total N, and the...

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