What is an event history model? Think of it like this – you are interested in whether something happens, what predicts whether it happens and how long until it happens. Let’s take a common one, like, say, death. An event history model could predict the duration from diagnosis of tuberculosis to death. In this model…
Whether you are a statistician, SPSS guru, SAS programmer or professor and world-renowned expert on re-incarceration, odds are great that you are susceptible to bubble-vision. You work, breathe and socialize within one or two very narrow bubbles. This is bad and unhealthy. You’ll miss much of life that is beautiful, exciting, dramatic, interesting, tragic and…
FINALLY got a few minutes to download the latest version. For some reason the download I received was for the planned installation as opposed to the basic installation. In 25 words or less, basic installation is for stand-alone installs on a single machine, which we have hundreds of users doing. The planned installation would be…
Here is how the Wald statistic works: You divide the maximum likelihood coefficient estimate by its standard error and square the result. If you wanted to be really specific about it, what you are dividing is the difference between the obtained coefficient estimate and your hypothesized estimate. I would say, though, that 99% of the…
I will be finishing reading thousands of pages of grants and spend a few days on grant reviews. A grant I have been working on is almost done. The semester is almost over. I have two articles I submitted to journals under review. So… the question is, what’s next? I thought about trying to make…
Because I am no fun at all, as any of my children can tell you, I do not have a post for April Fool’s Day (although you should totally check out the blog on SAS for the Wii ). Being counter-cyclical can be good at times, for example, making money on your investments last year….
All right, well maybe they are not that secret, but there are some really great resources out there that you may want to check out. If you didn’t get to the SPSS Higher Education Road Show at UCLA because rush hour in Los Angeles is from 7-9, 4-6 and any time you are on the…
You know that feeling after Thanksgiving dinner when you have had all of your favorite foods all at once and are so full that you think you will never eat again. Well, the past week has left my brain like that. Within twelve days, I attended the SPSS Higher Education Road Show at UCLA, then…
Since I have written about odds ratios and logs lately, I was going to write about the natural log of the odds ratio, however, random events have caused me to do otherwise. I read an interesting blog by Adam Jackson lately, in which he is concerned that robots will take over the world. At the…
Logistic regression is based on logarithms. Ordinary Least Squares regression and analysis of variance uses the actual values as the dependent and independent variables in an equation. Logistic regression does not. What is a log, anyway? Let’s start with the very basics. First we learned to add: 5+5+5+5 = 20 After about eight years of…