Coursera Developing Data Products: Project

Michiko
Sep. 24th 2015

Introduction

BMI (Body Mass Index) is an idex developed to give a rough idea of underweight, overweight and obesity. The index is calculated as below;

BMI = Weight (kg) / (Height (m) * Height (m))

Application

I developed an application in which users can simply fill in their weight and height to check their BMI. For example, when an application user fills in his/her weight as 60kg and height as 160cm, BMI is altomatically calculated as below;

BMI <- 60/(160/100)^2

Moreover, the applicatio indicates which category she/he belongs to based on the calculated BMI.

Class <- ifelse (BMI<18.5, "Underweight",
                 ifelse(BMI<25, "Normal Range",
                 ifelse(BMI<30, "Overweight","Obese")))
Class

[1] "Normal Range"

Category table and BMI information

There are two more tubs in the application.

Classification tub: a table showing categories with each BMI range
BMI info tub: More detailed information about BMI

Note

BMI is developed as a simple underweight/obesity check index. There are critiques that applying one simple formula for everyone might be misleading. If you are interested to know more about pros and cons of BMI, please visit WHO website (http://apps.who.int/bmi/index.jsp)