Estimate Car MPG consumption Simple Shiny Application

Herve Yu
Wed Mar 18 22:03:20 2015

Summary of the goal

Predict MPG consumption of a car based on

  • Transmission Type
  • Weight
  • Quarter Miles per second

The prediction trained on mtcars dataset extracted from the 1974 Motor Trend US magazineperformance for 32 automobiles (197374 models), using linear regression.

Regression Analysis

The general formula:


Call:
lm(formula = mpg ~ factor(am) + wt + qsec, data = mtcars)

Coefficients:
(Intercept)  factor(am)1           wt         qsec  
      9.618        2.936       -3.917        1.226
  • Automatic transmission: MPG = 9.62 - 3.92 * Weight + 1.22 * Quarter miles time
  • Manual transmission: MPG = 12.56 - 3.92 * Weight + 1.22 * Quarter miles time

Simulation with Shiny Apps

Deployed at shinyapps.oi website

Sidebar for data entry

  • Radio button for transmission selection
  • Slider for Weight manipulation
  • Textbox for Quarter mile second entry
  • Units of measure: Weight in 1000 lbs, Quarter Mile time in seconds.
  • The model predict an actual MPG with a variation of + or 4.9 MPG from the predicted MPG.

Simulation with Shiny Apps

Main block for Result Display

  • Estimated MPG based on entered criteria
  • Left Plot MPG over Weight
  • Right Plot MPG over Quarter Miles per second
  • Estimated value will appear as a triangle point on the plots