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.

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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FOIL is Verboten

My students and I have a habit of referring to the act of multiplying two binomial forms as FOILing, recalling the acronym FOIL (First, Outer, Inner, Last) for remembering the process.  My excuse for using the term  is that they use … Continue reading

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Here’s What You Don’t Get to Do

I started last Monday’s Precalculus II class with this little speech(edited). “Here’s what you don’t get to do.  When you have children, you don’t get to say, “I was bad at math.”  Because you are good at math.  You could … Continue reading

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Derooting with Radicals

My students were working in pairs on this problem, One group, looking for perfect square factors, had gotten this far, One person asked the other, “Now what?”  The other replied, “Just deroot the x to the eight and the y to the … Continue reading

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PEMDAS Strikes Again

Our pre-calculus class was going over how to combine sums and differences of logarithm expressions into a single logarithm when Steven Orton (He gave  permission to use his name.) asked, “What about PEMDAS?”  PEMDAS is an acronym used for remembering … Continue reading

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My Heart Aches

Yesterday I made my heart ache. I took a small action – made a small gesture at least in this day and age.  I can’t talk about it.  My students have an absolute right to privacy. I could have cried.

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