Body Mass Index (B.M.I.)

Ashwin Revo
Sept. 22, 2016

About B.M.I.

Defined as the body mass divided by the square of the body weight
Categorizes a person as underweight, normal weight, overweight or obese
Normal weight B.M.I ranges from 18.5 kg/m² to 25 kg/m²

Source: wikipedia

B.M.I. Calculation

B.M.I = (Weight in pounds)/(Height in inches² ) * 703 kg/m²

Wrote a shiny app to calculate B.M.I. as part of the coursera assignment work
https://ashwinrevo.shinyapps.io/bmiCalculator/

Example B.M.I on R dataset {women}

This dataset has the height and weight information of women in America
Will calculate the B.M.I values on this dataset to understand the mean B.M.I value of the female population in America

summary(women)

     height         weight     
 Min.   :58.0   Min.   :115.0  
 1st Qu.:61.5   1st Qu.:124.5  
 Median :65.0   Median :135.0  
 Mean   :65.0   Mean   :136.7  
 3rd Qu.:68.5   3rd Qu.:148.0  
 Max.   :72.0   Max.   :164.0

Histogram on R dataset {women}

bmi = women$weight/(women$height^2)*703
mx = mean(bmi)
hist(bmi, xlab="B.M.I.(kg/m2)", breaks=5, main="Histogram of B.M.I.")
abline(v = mx, col = "blue", lwd = 2)

plot of chunk unnamed-chunk-2