At the JMP seminar on Monday, when Dick De Veaux said that 65-70% of time in all research projects is spent on data cleaning, everyone in the audience groaned in agreement. One of the biggest problems I run into is recoding those simple textboxes. For example, we often want to look at data for one…
The model is non-significant, therefore my theory is supported. Huh? Just when you thought it was safe to get back into statistics… It took you two years of graduate school but now you have it down. P-value low = good, relationship detected, publication, tenure, Abercrombie & Fitch models at your feet. P-value = high, no…
Lately I have been on a roll looking at relatively less common statistical techniques, proportional hazards, survival analysis, etc. In keeping with that, I have been taking a look at propensity score matching, fondly known as PSM by, – well, by no one actually. The problem to be solved …. Think about some of these…
Event history models of all types have a few characteristics that make them unique. First of all, forget that whole symmetry thing around zero. Here our dependent variable of interest is time to event. We are interested in how long a person lives, remains sober, stays with a given company, or, in a study of…
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….