by Craig Marker | Feb 5, 2007 | Uncategorized
If I were to wager that at least two people in my classes do not share a common birthday, I would ‘almost surely’ be wrong. In my class of 28 students, there is about a 70% chance of two people sharing the same birthday. Let’s say I am to ask everyone their birthday....
by Craig Marker | Feb 2, 2007 | Uncategorized
Millions Of Americans Travel To Kentucky To Attend Barbaro’s FuneralLOUISVILLE, KY—In a stirring show of love and respect, millions of people—including Barbaro’s owners, breeders, associates, foreign dignitaries and heads of state from over 90 countries,...
by Craig Marker | Feb 1, 2007 | Uncategorized
Here is syntax to calculate Cohen’s d in SPSS. The final table provides a t-statistic, associated p-value and Cohen’s d.**Assuming two variables in the SPSS data file labeled.** IV – Independent variable (Groups 1 & 2);.** DV – Dependent...
by Craig Marker | Jan 31, 2007 | Uncategorized
The Social Science Statistics Blog has an interesting entry today on heterogeneity in observational studies. Below is an excerpt:”Imagine you are asked to conduct an observational study to estimate the effect of wearing a helmet on the risk of death in...
by Craig Marker | Jan 29, 2007 | Uncategorized
Here is an old silent movie describing Type I and Type II errors.
by Craig Marker | Jan 25, 2007 | Uncategorized
Scientific American: Fact or Fiction?: Premium Gasoline Delivers Premium Benefits to Your CarExploding the myth that premium gasoline delivers better performance in the average automobile
by Craig Marker | Jan 24, 2007 | Uncategorized
Scientific American: License to Work [ BY THE NUMBERS ]Professional licensing: Road to social atherosclerosis?
by Craig Marker | Jan 24, 2007 | Uncategorized
Economist discuss positional goods, which are goods that are in fixed supply. People can only enjoy these goods if others do not. Some examples include the best education, best jobs, and best home locations.Positional goods for previous generations have become...
by Craig Marker | Jan 22, 2007 | Uncategorized
In the beginning of the 20th century, the Guinness Brewing Company made an innovative move that changed the world of statistics. They hired William Gosset, a mathematician and chemist (they actually hired him for his chemistry skills, but it was his mathematical...
by Craig Marker | Jan 19, 2007 | Uncategorized
The Mahalanobis Blog has an interesting comment on nonlinear relations (the blog is actually on a much different topic). His example is uses a straight line to describe a relationship, when the relationship is much more complicated. Rather than summarizing it, here is...
