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  • Testing a Variance in R

    You might think that the function chisq.test() would be the best way to test a variance in R. Although base R provides this function, it’s not a...

    In Statistics

  • Plotting t in ggplot2

    The grammar-of-graphics approach takes considerably more effort when plotting the values of a t-distribution than base R. But follow along and youR...

    In Statistics

  • Plotting t in Base R Graphics

    Visualizing a distribution often helps you understand it. The process can be a bit involved in R, but it’s worth the effort. The figure shows th...

    In Statistics

  • Z Testing in R

    An R function called z.test() would be great for doing the kind of testing in which you use z-scores in the hypothesis test. One problem: That functio...

    In Statistics

  • Distributions in R

    The normal distribution family is one of many distribution families baked into R. Dealing with these families is intuitive. Follow these guidelines:...

    In Statistics