Section 5.13 Key Functions & Commands
The following functions and commands are introduced or reinforced in this chapter to support analysis of variance (ANOVA), post-hoc testing, and model comparison.
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set.seed()(base R)-
Ensures reproducibility when generating random data.
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rnorm()(stats)-
Generates random values from a normal distribution with a specified mean and standard deviation.
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aov()(stats)-
Fits one-way and two-way analysis of variance (ANOVA) models.
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summary()(base R)-
Produces summaries of ANOVA model results, including F statistics and p-values.
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supernova()(supernova)-
Displays ANOVA results in a clear, structured table emphasizing sums of squares and variance explained.
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TukeyHSD()(stats)-
Performs post-hoc pairwise comparisons following a significant ANOVA.
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plot()(base R)-
Visualizes post-hoc comparison results, such as Tukey’s HSD confidence intervals.
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aictab()(AICcmodavg)-
Compares competing statistical models using Akaike Information Criterion (AIC).
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