Author Archives: jrh794

About jrh794

I am a sixty-five year old math instructor at Southern Oregon University. I taught at the College of the Siskiyous in Weed California for twenty-six years. Prior to that I worked as a computer programmer, carpenter and in various other jobs. I graduated from Rice University in 1967 and have a MS in Operations Research from Stanford. In the past I have hand-built a stone house and taken long solo bicycle tours. Now I ride my mountain bike and play golf for recreation.

The “I” and the “You” of It All

Somewhere in my teaching career, now 35 years of it, “I” and “You” as grammatical subjects disappeared from my classroom vocabulary.  For instance, “I” don’t need you (the student) to understand this particular concept. “You” (the student) (in my opinion) … Continue reading

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This Is What “Power = .006” Looks Like.

My current screen saver is this graphic: I found it on Andrew Gelman’s blog here.  The red areas are based on an alpha (probability of rejecting a null hypothesis) of 0.05.  A recent paper (preprint) endorsed/authored by a fat paragraph of … Continue reading

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Dusting the Book Shelves

A summer chore was to dust the book shelves in my home.  As you can see, the shelves (There are two more bays of shelves to the right.)  have an open design thus collecting their share of dust and incidentally … Continue reading

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What to Ask

A student you know is having difficulties in a class.  Before giving advice, gather some facts.  Ask these questions. Did you go to every single class? If not, what did you do during those hours? If not, how did learn … Continue reading

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They Do What I Say

I am grading written out  “word” problems this morning.  Many of my students are using the steps I gave in class and explaining them well.  They are doing what I said.  For a moment I felt overwhelmed by the responsibility. … Continue reading

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Graphing Sampling Error for Ordinal Data

In previous posts I have been discussing how to treat rubric data as sample data.  The next post along these lines is intended to show how to apply various Bayesian methods to such data.  My plan was to contrast these methods … Continue reading

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Command Index to Statistical Rethinking

I am having a great time working through Richard McElreath’s text, Statistical Rethinking: A Bayesian Course with Examples in R and Stan.  The focus is on building, testing, interpreting, and improving  statistical models.  It is absolutely empowering and I have begun to … Continue reading

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