Blog Archives

When the “reorder” function just isn’t good enough…

May 6, 2013
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When the “reorder” function just isn’t good enough…

The reorder function, in R 3.0.0, is behaving strangely (or I’m really not understanding something).  Take the following simple data frame: df = data.frame(a1 = c(4,1,1,3,2,4,2), a2 = c(“h”,”j”,”j”,”e”,”c”,”h”,”c”)) I expect that if I call the reorder function on the … Continue reading →

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Do Torontonians Want a New Casino? Survey Analysis Part 1

May 2, 2013
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Do Torontonians Want a New Casino?  Survey Analysis Part 1

Toronto City Council is in the midst of a very lengthy process of considering whether or not to allow the OLG to build of a new casino in Toronto, and where.  The process started in November of 2012, and set … Continue reading →

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Using ddply to select the first record of every group

April 13, 2013
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Using ddply to select the first record of every group

I had a very long file of monetary transactions (about 207,000 rows) with about two handfuls of columns describing each transaction (including date).  The task I needed to perform on this file was to select the value from one of … Continue reading →

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Split, Apply, and Combine for ffdf

March 22, 2013
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Split, Apply, and Combine for ffdf

Call me incompetent, but I just can’t get ffdfdply to work with my ffdf dataframes.  I’ve tried repeatedly and it just doesn’t seem to work!  I’ve seen numerous examples on stackoverflow, but maybe I’m applying them incorrectly.  Wanting to do some … Continue reading →

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Finding Patterns Amongst Binary Variables with the homals Package

February 10, 2013
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Finding Patterns Amongst Binary Variables with the homals Package

It’s survey analysis season for me at work!  When analyzing survey data, the one kind of analysis I have realized that I’m not used to doing is finding patterns in binary data.  In other words, if I have a question … Continue reading →

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Multiple Classification and Authorship of the Hebrew Bible

January 1, 2013
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Multiple Classification and Authorship of the Hebrew Bible

Sitting in my synagogue this past Saturday, I started thinking about the authorship analysis that I did using function word counts from texts authored by Shakespeare, Austen, etc.  I started to wonder if I could do something similar with the … Continue reading →

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My Intro to Multiple Classification with Random Forests, Conditional Inference Trees, and Linear Discriminant Analysis

December 27, 2012
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My Intro to Multiple Classification with Random Forests, Conditional Inference Trees, and Linear Discriminant Analysis

After the work I did for my last post, I wanted to practice doing multiple classification.  I first thought of using the famous iris dataset, but felt that was a little boring.  Ideally, I wanted to look for a practice … Continue reading →

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Binary Classification – A Comparison of “Titanic” Proportions Between Logistic Regression, Random Forests, and Conditional Trees

December 23, 2012
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Binary Classification – A Comparison of “Titanic” Proportions Between Logistic Regression, Random Forests, and Conditional Trees

Now that I’m on my winter break, I’ve been taking a little bit of time to read up on some modelling techniques that I’ve never used before. Two such techniques are Random Forests and Conditional Trees.  Since both can be used … Continue reading →

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My Goodness. What a Fat Dataset!

October 25, 2012
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My Goodness.  What a Fat Dataset!

Recently at work we got sent a data file containing information on donations to a specific charitable organization, ranging all the way back to the 80′s.  Usually, when we receive a dataset with a donation history in it, each row … Continue reading →

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Know Your Dataset: Specifying colClasses to load up an ffdf

October 10, 2012
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Know Your Dataset: Specifying colClasses to load up an ffdf

When I finally figured out how to successfully use the ff package to load data into R, I was apparently working with relatively pain free data to load up through read.csv.ffdf (see my previous post).  Just this past Sunday, I … Continue reading →

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