Tag: #epidemiology

The Hijacking of Fluorine 18.998, Part Three

In the last two blog posts (here and here), I told you about the history of fluoridation of water in the United States and other parts of the world. I told you how a dentist traveled out west to Colorado and, through observation and laboratory study, helped determine that adding fluoride to drinking water prevented tooth decay. Of course, the…

The Hijacking of Fluorine 18.998, Part Two

NOTE: This is the second of a three-part series on fluoride in drinking water and a recent study about it. You can read part 1 here. You can read part 3 here. In the last blog post, I told you all about how fluoride has been added to potable water systems in the United States and elsewhere based on the…

Sample Sizes and Statistical Significance

Some dude said I didn’t know what I was talking about because, in his world, a small sample size with a statistical significance only gets more statistically significant if the sample size increases. He’s also an antivaxxer, so…

How Many Guns Were Within 1,000 Feet of Schools in Baltimore in 2018?

Modern software programs allow you to analyze spatial data quite easily, but it may be hard to replicate what you did without a detailed how-to manual and instructions you write as you go. Programming languages such as R and others allow you to write code and comments in that code, so it will be easy to follow what you did and reproduce it time after time.

What if Vaccines Are Harmful?

If vaccines are as bad as anti-vaccine people and groups claim that they are, where is the evidence? We’ve seen other diseases and conditions be identified and dealt with. Why not these bad vaccine outcomes? Could it be that it’s not as bad as antivaxxers say it is?

One-Way ANOVA Analyses, by Hand and in R

A student asked for help with a statistical analysis the other night, and I was happy to help. However, he threw me a curveball when he told me he needed to conduct an ANOVA test using only summary data. That is, all he had was the table of results (from a publication) and not the data. Doing an ANOVA by…