Craig Covey
Data Analyst
The purpose of the Motor Trend Vehicle Analysis app is to analysize the mtcars dataset through an interactive chart. The app allows the user to:
The data for the app comes from mtcars dataset provided by R. The dataset is titled Motor Trend Car Road Tests and was extracted from the 1974 Motor Trend US magazine, and comprises fuel consumption and 10 aspects of automobile design and performance for 32 automobiles (1973-74 models).
library(knitr)
## Warning: package 'knitr' was built under R version 3.2.5
data(mtcars)
kable(head(mtcars))
| mpg | cyl | disp | hp | drat | wt | qsec | vs | am | gear | carb | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mazda RX4 | 21.0 | 6 | 160 | 110 | 3.90 | 2.620 | 16.46 | 0 | 1 | 4 | 4 |
| Mazda RX4 Wag | 21.0 | 6 | 160 | 110 | 3.90 | 2.875 | 17.02 | 0 | 1 | 4 | 4 |
| Datsun 710 | 22.8 | 4 | 108 | 93 | 3.85 | 2.320 | 18.61 | 1 | 1 | 4 | 1 |
| Hornet 4 Drive | 21.4 | 6 | 258 | 110 | 3.08 | 3.215 | 19.44 | 1 | 0 | 3 | 1 |
| Hornet Sportabout | 18.7 | 8 | 360 | 175 | 3.15 | 3.440 | 17.02 | 0 | 0 | 3 | 2 |
| Valiant | 18.1 | 6 | 225 | 105 | 2.76 | 3.460 | 20.22 | 1 | 0 | 3 | 1 |
In the sidebar panel on the upper left of the app there are three dropbown boxes titled: Select X-Axis, Select Y-Axis, and Select Color. Each dropdown contains a list of all eleven variables of the mtcars dataset. Selecting a variable from the dropdown list changes the respective feature on the chart instantaneously.
In the sidebar panel on the middle left of the app under the heading Choose Smoothing are three radio buttons. The default value is None. The second option Linear Regresssion adds a linear regression line with a confidence interval are to chart. The third toption Smooth Curve (LOESS) adds a smooth curve line through the data points.
Below the Choose Smoothing radio buttons is a section heading Confidence Interval with a single checkbox. This turns the confidence interval shading area on and off around the smoothing line.
