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In this video we continue our illustration of one-way ANOVA models in R
through Example 11 in Mod13Script.R. You should open this script in
RStudio and follow along while watching. In this…
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In Module 13 we cover the implementation of basic statistical methods in R. We begin with a discussion of some functions to compute summary statistics and to characterize univariate distributions. In…
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Frequency distributions (univariate and joint) can be displayed in contingency tables, or cross-tabulations. In this video we show how tapply() can be used to create such tables, but we…
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The tapply() function is one of several "apply" functions in R that allow a function to operate on data repeatedly. The function tapply() applies a function to groups of observations within…
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In this video we continue to discuss subscripts, this time concentrating on matrices and arrays. Each dimension of these structures may be subscripted to return a sub-matrix or sub-array of the…
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In this video we introduce the various data structures in R, concentrating on vectors.Vectors are the fundamental unit in R, so it is important to understand how to form and manipulate them. While…
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This video presents an extended example from Mod8Script.R that deals with some fictitious quiz score data. Here we introduce several new functions for computing summary statistics and the t.test()…
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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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PROC ANOVA can handle one-way ANOVA models and multi-way ANOVAs with balanced data. It should not be used to fit and make inference from unbalanced multi-way ANOVA models. In this video we introduce…
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This video illustrates PROC UNIVARIATE for conducting a one sample t test and examining the assumption of normality underlying the t test. It also features the use of the ODS SELECT statement. PROC…
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PROC PRINT is a fairly simple procedure that you will use again and again. Learning its basic usage is easy, but this video also covers some additional topics like printing with BY groups; the SUM…
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This video describes how SAS processes a data step. It is important to understand that SAS accesses one observation at a time and processes each observation in a temporary location called the program…
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