The Weight and Height Prediction and BMI calculator

• This app try to predict your normal weight and height according your given height an weight.

• Furthe more, you will get your BMI (Body Mass Index) and see your BMI categoy.

• to get started, input your weight and height seperately and click Submit.

• We use women data set in R.

library(datasets)
data(women)

Weight Prediction Process is as follows, we use lm function to model our data and use predict to calcualte the result

predictWeight <- function( yourHeight ){
  fit <- lm( weight~height , data = women )
  yourData <- data.frame(height=yourHeight)
  predict( fit , newdata = yourData )
}
predictWeight( 70 ) #Suppose your height is 70 inches

       1 
153.9833 

The Height Prediction Process is quite similar as Weight Prediction

The BMI is calculated by following function

calcBMI <- function( height , weight ) (weight*0.4535)/(height*0.0254)^2

Suppose your height is 70 inches, and your weight is 146 pounds, Then the following invokation calculate the BMI.

calcBMI( 70 , 146 )

[1] 20.94434

According to the computed BMI value, we can choose the category, the rule is as follows:

• Underweight <= 18.5
• Normal Weight == 18.5~24.9
• Overweight == 25~29.9
• Obesity = BMI of 30 or greater

• This app can be viewd on: https://liuyubobobo.shinyapps.io/bmi-calculator

• The data set used in this app appears to have been taken from the American Society of Actuaries Build and Blood Pressure Study for some (unknown to us) earlier year.

• This data set gives the average heights and weights for American women aged from 30 to 39.So it may be not accuracy for men or women beyong that age range.

• Source, The World Almanac and Book of Facts, 1975.

• References, McNeil, D. R. (1977) Interactive Data Analysis. Wiley.