# Blog Archives

## A Population Regression

April 18, 2011
By

Here's a video on some of the theory behind simple linear regression.There's no R involved with this video, but the video provides some theory behind what it is that R's lm() command estimates.

## A Creative Use of R

April 17, 2011
By

Update (5/18/2011): Looks like Freakonomics approves as well. Let the record show that I approved first :)I approve: "I use the open-source program R to create the patterns."But, I'm not sure I approve of calling these distributions "evil."In case you...

## Computing Statistical Power

April 14, 2011
By

Today's task is to compute a statistical power function in R. For a good definition of power, go here. Thinking about the power of a testing procedure is an often-overlooked aspect of hypothesis testing.I also explain what power (in a statistical sens...

## Video Tutorial on Robust Standard Errors

April 12, 2011
By

Update: I have included a modified version of this summaryR() command as part of my package tonymisc, which extends mtable() to report robust standard errors. The tonymisc package is available on CRAN through the install.packages() command.If you have...

## Video Tutorial on IV Regression

April 10, 2011
By

Update: I am working on a better augmentation of the current IV regression functions (specifically ivreg() in AER) in R. I will post a link here to my new method/function for IV regression when I finish debugging the code.Update 2: [15 Ma...

## How did I make this plot?

April 9, 2011
By

To make this plot, I used R's plot(), points() and lines() commands. If you have been wanting to learn how to plot in R, watch it unfold in this video tutorial:Also, here's the code I used:

## How to Shade Under a Normal Density in R

April 3, 2011
By

The easiest-to-find method for shading under a normal density is to use the polygon() command. That link is to the first hit on Google for "Shading Under a Normal Curve in R." It works (like a charm), but it is not the most intuitive way to let users p...

## How to Bootstrap in R: The Case of R-squared

March 29, 2011
By

I recorded a new video tutorial whose original intent was to demonstrate how to write a for loop. As I wanted to make the for loop count for something, I decided that my application would be to write some code that computes the bootstrap approximation ...

## An easier to use IV regression command in R

March 10, 2011
By

Update: I have added some functionality to my ivregress() command. Check out my newer post here.After I posted my last video tutorial on how to use my IV regression function, I received a comment asking why I didn't write the command a different way t...

## Video Tutorial on Instrumental Variables in R

March 8, 2011
By

Update: I have replaced this video tutorial with a video tutorial on a newer, easier to use IV regression command. Check out that command here.In this video, I show how to use my instrumental variables function in R, ivreg(), along with its companion ...