Presentation on mtcars model

Winston Saunders
December 2014

My cool project

Okay this project is really not all that cool. In fact is it pretty darn simple. But at least it works in shiny, which is more than I can say about my first attempt at something more ambitious. It does the following things:

  • Loads the mtcars data.
  • Plots a historgram of the mpg (miles per gallon).
  • Adds a slider to the histogram so you can see the mean square error from a test “mu”.
  • Does a glm of the mt cars mpg data based on vehicle weight and displacement.
  • Plots a histogram and a mean square error slider with test “mu”.

The histogram

This shows a histogram of the mtcars mpg data.

hist(cardata$mpg, xlab='mpg', col='lightblue',main='Histogram of Data', breaks=10, xlim=c(5,40), ylim=c(0,8))

plot of chunk histo1

The histogram with offset mean

The offset mean can bee seen to increase the mean square error (MSE).

                        mu <- 25.

plot of chunk histo2

Model the Data

Here is a model of the data. Again the mean square error is shown. 

        formula <- mpg~disp+wt

plot of chunk model