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Making Your First GitHub R Project

Increasingly, academic scholars, data scientists, and quantitative researchers are turning to GitHub for collaboration and to share data, code, and results. GitHub allows people to host public and private “repositories”...

Sensitivity Analysis for Not Missing at Random

When I teach my seminar on Missing Data, the most common question I get is “What can I do if my...
Sep 25, 2014
5

Problems with the Hybrid Method

For several years now, I’ve been promoting something I called the “hybrid method” as a way of analyzing longitudinal and other...
Sep 02, 2014
23

Free SAS!

UPDATE, 11 February 2021.  SAS University Edition will soon be phased out.  It will end completely on Aug. 2, 2021. You...
Jul 24, 2014
43

Prediction vs. Causation in Regression Analysis

In the first chapter of my 1999 book Multiple Regression, I wrote “There are two main uses of multiple regression: prediction...
Jul 08, 2014
63

Listwise Deletion: It’s NOT Evil

At the 1998 Annual Meeting of the American Political Science Association, Gary King and three co-authors presented a paper titled “Listwise...
Jun 13, 2014
2

Another Goodness-of-Fit Test for Logistic Regression

In my April post, I described a new method for testing the goodness of fit (GOF) of a logistic regression model...
May 07, 2014
10

Alternatives to the Hosmer-Lemeshow Test

In my post of March 2013, I pointed out some of the deficiencies of the Hosmer-Lemeshow test for goodness-of-fit (GOF) of...
Apr 09, 2014
6

Rejected? Keep at it.

Journal editors are people, just like the researchers who submit their work for publication.  People make mistakes.  Journal editors often fail...
Apr 08, 2013
6

Why I Don’t Trust the Hosmer-Lemeshow Test for Logistic Regression

The Hosmer-Lemeshow (HL) test for logistic regression is widely used to answer the question “How well does my model fit the...
Mar 05, 2013
62

What’s the Best R-Squared for Logistic Regression?

One of the most frequent questions I get about logistic regression is “How can I tell if my model fits the...
Feb 13, 2013
84

Everybody’s Gonna Have a Number

This month I’m going to take a break from statistical methods and focus, instead, on a particular statistic: citation counts. Recently...
Jan 07, 2013
2

Why Learn Syntax?

One of the reasons so many people choose SPSS for data analysis is that it is quite simple to use, with...
Dec 03, 2012
2