Blog Archives

Extending mtable() to ivreg, gls and robust standard errors

May 9, 2011
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Extending mtable() to ivreg, gls and robust standard errors

I have written several extensions of the mtable() command in the memisc library that may come in handy. The methods are available in a package I have written called tonymisc (now, available on CRAN). A zipped folder with my package files is available...

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Putting Robust Standard Errors into LaTeX Tables: An Extension of mtable

May 3, 2011
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Putting Robust Standard Errors into LaTeX Tables: An Extension of mtable

I recently discovered the mtable() command in the memisc library and its use with toLatex() to produce nice summary output for lm and glm objects in a nicely formatted table like this:Once you have your linear model objects, all you need is one command...

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Forming Formulas

April 29, 2011
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Forming Formulas

One of the first functions a new R user learns how to use is the lm() command, which involves stating the model formula.lm(y~x1+x2, data=mydata)After a while, this just becomes a natural way to say "I want a regression of y on x1 and x2 using mydata." ...

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Automatically Save Your Plots to a Folder

April 26, 2011
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Automatically Save Your Plots to a Folder

Suppose you're working on a problem that involves a loop for calculations. At each iteration inside the loop, you want to construct a plot. Not only do you want to see the plot, but you would like to save each plot for a presentation, report or paper...

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R Bloggers

April 26, 2011
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R Bloggers

I recently found a great resource for R in the blogosphere, the R Bloggers Blog Aggregator. Basically, the site aggregates posts from a bunch of blogs about R (like this one!) into a giant feed of uses for R. If you are interested in learning more ab...

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Merging Data Video Tutorial

April 25, 2011
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Merging Data Video Tutorial

Here's a video tutorial where I walk through some code that does what the previous post describes.The FRED data is used extensively for macroeconomics. You might these data useful for joining in graph fights in the blogosphere.

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Merging Multiple Data Files into One Data Frame

April 24, 2011
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Merging Multiple Data Files into One Data Frame

We often encounter situations where we have data in multiple files, at different frequencies and on different subsets of observations, but we would like to match them to one another as completely and systematically as possible. In R, the merge() comma...

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Dates in R and the First Day of the Month

April 23, 2011
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Dates in R and the First Day of the Month

I spent some time this morning learning about how R thinks about dates in R. I found this website to be a useful guide.Imagine that your data are dates in a standard format and you want a vector o...

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Good Looking Maps in R

April 21, 2011
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Good Looking Maps in R

I haven't yet tried this, but it looks like a nice package.In one recent project I needed to draw several maps and visualize different kinds of geographical data on it. I found the combination of R/ggplot/maps package extremely flexible and powerful,...

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Common Data Creation Commands

April 19, 2011
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Common Data Creation Commands

Here is a video tutorial where I go through some of the most commonly used commands in creating and manipulating data. As soon as I want to do more than just running a single regression, I use these commands more than any other set of commands (in som...

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