Project Overview

• Seek insight from the dataset with Exploratory Data Analysis
• Performed Data Processing, Data Engineering and Feature Transformation to prepare data before modeling
• Built a model to predict Insurance Cost based on the features
• Evaluated the model using various Performance Metrics like RMSE, R2, Testing Accuracy, Training Accuracy and MAE

Data source : https://www.kaggle.com/mirichoi0218/insurance

Data Definition

1. age: age of primary beneficiary
2. sex: insurance contractor gender, female, male
3. bmi: Body mass index, providing an understanding of body, weights that are relatively high or low relative to height, objective index of body weight (kg / m ^ 2) using the ratio of height to weight, ideally 18.5 to 24.9
4. children: Number of children covered by health insurance / Number of dependents
5. smoker: Smoking
6. region: the beneficiary's residential area in the US, northeast, southeast, southwest, northwest
7. charges: Individual medical costs billed by health insurance

Data Processing

1. Check missing value - there are none
   
2. Check duplicate value - there are 1 duplicate, will be remove
   
3. Feature engineering - make a new column weight_status based on BMI score
   
4. Feature transformation:
   A) Encoding sex, region, & weight_status attributes
   B) Ordinal encoding smoker attribute
   
5. Modeling:
   A) Separating target & features
   B) Splitting train & test data
   C) Modeling using Linear Regression, Random Forest, Decision Tree, Ridge, & Lasso algorithm
   D) Find the best algorithm
   E) Tuning Hyperparameter
   

Exploratory Data Analysis

• Feature sex, region has an almost balanced amount, meanwhile most people are non smoker & obese

• A person who smoke and have BMI above 30 tends to have a higher medical cost

• Older people who smoke have more expensive charges

• People who smoke and obese have the highest average charges compared to others

Model Evaluation

Score	LinearRegression	DecisionTree	RandomForest	Ridge
R2	0.77	0.78	0.78	0.86
Train Accuracy	0.74	1.0	0.97	0.74
MAE	4305.20	2798.83	2608.55	4311.10
Test Accuracy	0.77	0.78	0.86	0.77
RMSE	6209.88	6067.50	4841.88	6238.13

Conclusion

Based on the predictive modeling, Linear Regression algorithm has the best score compared to the others, with MAE Score 4305.20, RMSE Score 6209.88, & R2 Score 0.77.
Therefore, Linear Regression algorithm is the best fitted model based on the training and testing accuracy.