Posts Tagged ‘ Data Analysis ’

Using and Producing a Control Chart in R for Statistical Process Control – An Application in Analytical Chemistry

Using and Producing a Control Chart in R for Statistical Process Control – An Application in Analytical Chemistry

Introduction Many processes in chemistry, especially in synthesis, require attaining a certain target value for a property of interest.  For example, when synthesizing drug capsules that contain a medicine, a chemist has to ensure that the concentration of the medicine meets a target value.  If the concentration is too high or too low, then the patient […]

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Odds ratio plots with a logarithmic scale in SAS

July 29, 2015
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Odds ratio plots with a logarithmic scale in SAS

I recently read an argument by Andrew Wheeler for using a logarithmic axis for plotting odds ratios. I found his argument convincing. Accordingly, this blog post shows how to create an odds ratio plot in SAS where the ratio axis is displayed on a log scale. Thanks to Bob Derr […] The post Odds ratio plots with a logarithmic scale in SAS appeared first on The DO Loop.

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Wealth and winning in NC high school athletics

July 26, 2015
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Wealth and winning in NC high school athletics

The Raleigh News & Observer published a front-page article about the effect of wealth and poverty on high school athletics in North Carolina. In particular, the article concluded that "high schools with a high percentage of poor students rarely win titles in the so-called country club sports—tennis, golf and swimming—and […] The post Wealth and winning in NC high school athletics appeared first on The DO Loop.

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The relationship between toothlessness and income

July 24, 2015
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The relationship between toothlessness and income

My colleague Robert Allison finds the most interesting data sets to visualize! Yesterday he posted a visualization of toothless seniors in the US. More precisely, he created graphs that show the estimated prevalence of adults (65 years or older) who have had all their natural teeth extracted. The dental profession […] The post The relationship between toothlessness and income appeared first on The DO Loop.

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Visualizing the distribution of ACT scores

July 17, 2015
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Visualizing the distribution of ACT scores

My son is in high school and plans to take the ACT, a standardized test to assess college aptitude and readiness. My wife asked, "What is a good score for the ACT?" I didn't know, but I did a quick internet search and discovered a tabulation of scores for the […] The post Visualizing the distribution of ACT scores appeared first on The DO Loop.

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How to Winsorize data in SAS

July 15, 2015
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How to Winsorize data in SAS

Recently a SAS customer asked how to Winsorize data in SAS. Winsorization is best known as a way to construct robust univariate statistics. The Winsorized mean is a robust estimate of location. The Winsorized mean is similar to the trimmed mean, and both are described in the documentation for PROC […] The post How to Winsorize data in SAS appeared first on The DO Loop.

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Merge observed outcomes into a list of all outcomes

July 1, 2015
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Merge observed outcomes into a list of all outcomes

When you count the outcomes of an experiment, you do not always observe all of the possible outcomes. For example, if you roll a six-sided die 10 times, it might be that the "1" face does not appear in those 10 rolls. Obviously, this situation occurs more frequently with small […] The post Merge observed outcomes into a list of all outcomes appeared first on The DO Loop.

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The spiral of splatter

June 11, 2015
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The spiral of splatter

"Daddy, help! Help me! Come quick!" I heard my daughter's screams from the upstairs bathroom and bounded up the stairs two at a time. Was she hurt? Bleeding? Was the toilet overflowing? When I arrived in the doorway, she pointed at the wall and at the floor. The wall was […] The post The spiral of splatter appeared first on The DO Loop.

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The mystery of the density curve that was too short

June 3, 2015
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The mystery of the density curve that was too short

I was reading a statistics book when I encountered a histogram that caught my eye. The histogram looked similar to the one at the left. It contained a normal density estimate overlaid on a histogram, but the height of the density curve seemed too short when compared to the heights […] The post The mystery of the density curve that was too short appeared first on The DO Loop.

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SAS/IML functions that operate on columns of a matrix

June 1, 2015
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SAS/IML functions that operate on columns of a matrix

A SAS programmer asked for a list of SAS/IML functions that operate on the columns of an n x p matrix and return a 1 x p row vector of results. The functions that behave this way tend to compute univariate descriptive statistics such as the mean, median, standard deviation, and quantiles. The following […] The post SAS/IML functions that operate on columns of a matrix appeared first on The DO Loop.

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