Articles by Schaun Wheeler

A simple amortization function

August 29, 2013 | Schaun Wheeler

I was working on a project yesterday where I needed to amortize out a bunch of loans to calculate the total interest a borrower would pay if he or she paid the minimum monthly payment for the full term of the loan. I couldn’t find any package in R ... [Read more...]

Slightly-more-than-basic sentiment analysis

September 14, 2012 | Schaun Wheeler

I became interested in sentiment analysis a few months ago as a matter of pure practicality. The company I work for does a lot of customer-satisfaction surveys. Respondents rate various aspects of our products, but they also have the opportunity to answer a bunch of open-ended questions in their own ... [Read more...]

Automatic cleaning of messy text data

September 13, 2012 | Schaun Wheeler

[UPDATE: I just wrapped AspellCheck() in a llply/laply wrapper from Hadley Wickham's `plyr` package, so now it can be run on a vector of texts as well as a single character string, and it now has a default progress bar (set progress = "none" to turn it off). But you ... [Read more...]

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