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Awareness of students’ mental health is growing in academia right now. Unsurprisingly, faculty suffer mental illness too, and many do not seek help from their institutions. The fear that disclosure, even to the disability office, will have negative effects on one’s professional career is a common reason for not seeking help.


In 2016 I started thinking about using sum to zero contrasts and wrote a brief blog post about them. Someone read it! I got this email the other day: Thank you for this post. I have difficulties understanding it though because the text below the first R output seems not to match with the model output. At first, one cannot see which species is species1,2 etc. Second the numbers are also not correct… Would be cool if you could check it and correct it because then it would be a useful post!


I set up 4 10 gallon aquaria in the teaching lab this semester. The goal was to observe the nitrogen cycle as the tanks settled in. I also needed an excuse to try out the new Hach environmental water testing kit that we ordered. The data are on figshare.


A colleague wrote: Hi Drew, I’m trying to make a really simple (I think) plot in R, but am not sure how to do it. I want to make the attached, where the size of each “bubble” in each grid location depends on a single raw data point (% cover of a type of grass). Can you point me in the right direction? This is the goal.


Really. I have no concept of what my students’ lives are like, and this is something I have to constantly remind myself. I cannot make assumptions about their situations based on my own experience.



I am the instructor for the following courses at University of Nebraska-Lincoln:

I sometimes give workshops on analyzing data with R:

Follow these instructions to set up your computer to use R prior to the first class or start of your workshop.