Hey, if you are a furloughed federal employee looking for something free to do on Thursday because you still haven’t received your back pay that Congress promised you, you can drop on into Salem, Oregon to the Oregon SAS Conference. I will be speaking on Categorical Data Analysis, Telling Stories with Your Data and How…
What is item difficulty analysis and how is it helpful? Item difficulty analysis is simply examining what percentage of students answered each item correctly. Item difficulty analysis is one basic way to establish test validity. One would expect that items at the second-grade level would have the lowest level of difficulty, being answered by the…
My doctoral advisor, the late, great Dr. Eyman, used to tell me that my psychometric theory lectures were, A light treatment of a very serious subject. Hmph. Well, with all due respect to a truly wonderful mentor, I still have to state unequivocally that the majority of students when looking at a factor analysis for…
So, yesterday, if you were paying attention, we figured out WHY to do a factor analysis today’s post is about how. I’m using SAS Enterprise Guide because I had it open on my computer. Here is what the completed project looks like: Here is what I did, reading from the top — I opened…
Spirit Lake: The Game is mostly an adventure game that teaches math. However, it has lots of Easter eggs, side quests and spin-offs added because hey, these are kids and sometimes they like to do something different and some of them have the attention span of an ant. Our idea is to make the game…
Last week I wrote a bit about how to get an exploratory factor analysis using Mplus. The question now, is what does that output MEAN ? First, you just get some information on the programming statements or defaults that produced your output: INPUT READING TERMINATED NORMALLY Exploratory Factor Analysis ; SUMMARY OF ANALYSIS Number of…
Someone had a question about factor analysis with Mplus and even though it is not a piece of software I work with normally, we aim to please at The Julia Group, so I downloaded the demo version and away I went. It truly was, as my granddaughter says, easy-peasy lemon squeezie. You might not think…
I haven’t been using Enterprise Guide much lately but tonight I could not get the SAS Web Editor to work and I had some graphs I needed to get done. It was convenient to do this with SAS Enterprise Guide because I wanted to do bar charts of the mean of one variable broken down…
In new product development, in research, you WILL go down some dead ends. Accept it.
We don’t perfect design in our programming until we’re sure we’re going to keep it. Here is a link to the article from 2003 that impressed me, which I mentioned in the video.