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Sarah-Jane is an ecologist who sometimes masquerades as a geneticist. Her statistical knowledge is embarassing in some social circles, but revered in others. Which probably just makes it neutral.
She has a PhD in ecology from the University of Canterbury, NZ.
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In the previous article, I showed you how to interpret mean-squared displacement (MSD) and showed four easy things you can learn from an MSD graph at a quick glance. Now let’s turn from analyzing an MSD plot to making one. I am going to use the programming language R to generate simulated data and then…
….statistics. The very word strikes fear into the heart of many a biologist (including me). In an article published earlier this year, Cumming and co-workers of La Trobe University, Melbourne gave a very useful rundown of common mistakes made when using statistical error bars in biology and suggested a number of rules that should be…
Researchers must show the statistical accuracy, validity, and significance of their data. So here are two ways to compare two sets of data.
Your lab is full of non-chemical hazards that can explode, stab, kill, and – as if that wasn’t enough – bite. Here’s a list of those hazards to remind you why Environmental Health & Safety exists! 1. Centrifuges Centrifuges are dangerous, especially when not cared for! An unmaintained ultracentrifuge imploded in an American lab in…
This column is loaded with pop quizzes for you to test yourself on. If you haven’t already done so, catch up on yesterday’s piece on hypothesis testing for a refresher. Take a gander at the table below for a summary of the two types of error that can result from hypothesis testing. Type I Errors occur…
Last week I focused on the left-hand side of this diagram and talked about statistical tests for comparing only two datasets. Unfortunately, many experiments are more complicated and have three or more datasets. Different statistical tests are used for comparing multiple data sets. Today I will focus on the right side of the diagram and…
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