Tag: #biostatistics

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…

The Hijacking of Fluorine 18.998, Part One

NOTE: This is the first of a three-part series on fluoride in drinking water and a recent study about it. You can read part 2 here. You can read part 3 here. There is a cultural controversy dating back several decades that is very similar to the anti-vaccine controversy that we are dealing with today. Back in the early 1900s,…

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…

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…

Biostatistics By Hand? Yes, Please!

When I was studying medical technology, my professors and mentors emphasized the need to learn to do by hand all of the procedures that automated instruments did. Those instruments, which are veritable robots, can do a complete cell count in a few minutes. Doing a complete cell count by hand takes at least an hour if you’re good and organized……