by Craig Marker | Dec 4, 2006 | Uncategorized
When creating a database of variables in a longitudinal study, there is often a question of how to format the data.Each row can be a person and for every new time he or she is tested a new variable is created (wide format):Or, a new row can be started for each new...
by Craig Marker | Dec 3, 2006 | Uncategorized
Having recently rented a rental vehicle, I had to decide whether I wanted to purchase the rental insurance. For only $32, I could have a $1,000,000 insurance policy (can I really do that much damage?). My choice was to not buy it, although I felt a great amount of...
by Craig Marker | Dec 3, 2006 | Uncategorized
I really enjoy the podcast from UCLA on statistics. They give interesting tidbits and hints on statistical programs. They are actually quite entertaining. There are currently 8 episodes. I am not sure whether they plan more, but sending them nice emails telling them...
by Craig Marker | Dec 1, 2006 | Uncategorized
Someone has always got to win the lottery.It is a very true statement that someone does win the lottery. However, the odds of me winning the lottery are extremely small. Another way to think about it is that it is highly unlikely that I will win the lottery, but it is...
by Craig Marker | Nov 29, 2006 | Uncategorized
In many fields people try to predict group membership. One example includes making diagnostic predictions (e.g., does this person have a disease or diagnosis?). Another example is predicting who will attempt a terrorist act. Malcolm Gladwell, in the New Yorker, has an...
by Craig Marker | Nov 29, 2006 | Uncategorized
In the August 4, 2006 issue of Science, research discuss a study describing how framing a question can effect how people decide to act. In this study, researchers told participants they would receive a sum of money and then the researchers repeatedly posed them one of...
