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In this video we illustrate two methods for putting multiple plots on a single page. The first approach is to set the mfrow or mfcol graphical parameter with the par() function. These parameters…
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The ifelse() function and if-else statements can be used to evaluate one of two expressions or chunks of code depending upon a Boolean logical condition. However, these constructions must be chained…
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Conditional execution is a fundamental technique in all computer programming and most computing languages have an if statement. The if and if else statements in R are similar to those in other…
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In this video we implement a one-way ANOVA in PROC GLM, using the same example (Example #8 on Pizza Diameters) as in the previous video. But here we discuss the important difference between the…
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In this video we analyze the pizza diameter data using a two-way ANOVA model implemented in PROC GLM. Here we see how to specify the model and how to use the SLICE option on the LSMEANS to test…
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This video illustrates PROC TTEST for conducting two-sample t tests. Our example is the Dominos-Eagle Boys Pizza dataset. In this example we see that it is important to conduct this test separately…
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