Posts Tagged ‘ Uncategorized ’

Truncate response surfaces

March 20, 2019
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Truncate response surfaces

An analyst was using SAS to analyze some data from an experiment. He noticed that the response variable is always positive (such as volume, size, or weight), but his statistical model predicts some negative responses. He posted the data and asked if it is possible to modify the graph so

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Data Science Software Reviews: Forrester vs. Gartner

March 19, 2019
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Data Science Software Reviews: Forrester vs. Gartner

In my previous post, I discussed Gartner's reviews of data science software companies. In this post, I show Forrester's coverage and discuss how radically different it is. As usual, this post is already integrated into my regularly-updated article, The Popularity of Data Science Software. Continue reading
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Interpolation vs extrapolation: the convex hull of multivariate data

March 18, 2019
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Interpolation vs extrapolation: the convex hull of multivariate data

Statisticians often emphasize the dangers of extrapolating from a univariate regression model. A common exercise in introductory statistics is to ask students to compute a model of population growth and predict the population far in the future. The students learn that extrapolating from a model can result in a nonsensical

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The value of pi depends on how you measure distance

March 13, 2019
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The value of pi depends on how you measure distance

It's time to celebrate Pi Day! Every year on March 14th (written 3/14 in the US), math-loving folks celebrate "all things pi-related" because 3.14 is the three-decimal approximation to the mathematical constant, π. Although children learn that pi is approximately 3.14159..., the actual definition of π is the ratio of

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How to detect SAS data sets that contain (or do not contain) character variables

March 11, 2019
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How to detect SAS data sets that contain (or do not contain) character variables

A SAS programmer posted an interesting question on a SAS discussion forum. The programmer wanted to iterate over hundreds of SAS data sets, read in all the character variables, and then do some analysis. However, not every data set contains character variables, and SAS complains when you ask it to

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Use PROC BOXPLOT to display hundreds of box plots

March 6, 2019
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Use PROC BOXPLOT to display hundreds of box plots

A previous article shows how to use a scatter plot to visualize the average SAT scores for all high schools in North Carolina. The schools are grouped by school districts and ranked according to the median value of the schools in the district. For the school districts that have many

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Visualize SAT scores in North Carolina

March 4, 2019
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Visualize SAT scores in North Carolina

Standardized tests like the SAT and ACT can cause stress for both high school students and their parents, but according to a Wall Street Journal article, the SAT and ACT "provide an invaluable measure of how students are likely to perform in college and beyond." Naturally, students wonder how their

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We’re moving on: SAS Learning Post has merged with SAS Users

February 27, 2019
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The SAS Learning post has merged with the SAS Users blog to provide you with all the training, certification, books, events, and programming tips you need. The post We’re moving on: SAS Learning Post has merged with SAS Users appeared first on SAS Lear...
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