Interview Prep
Career
GenAI
Prompt Engg
ChatGPT
LLM
Langchain
RAG
AI Agents
Machine Learning
Deep Learning
GenAI Tools
LLMOps
Python
NLP
SQL
AIML Projects

Reading list

Machine Learning Basics for a Newbie
6 Steps of Machine learning Lifecycle Introduction to Predictive Modeling
Introduction to Exploratory Data Analysis & Data Insights Descriptive Statistics Inferential Statistics How to Understand Population Distributions?
Reading Data Files into Python Different Variable Datatypes
Probability for Data Science Basic Concepts of Probability Axioms of Probability Conditional Probability
Central Tendencies for Continuous Variables Spread of Data KDE plots for Continuous Variable Overview of Distribution for Continuous variables Normal Distribution Skewed Distribution Skeweness and Kurtosis Distribution for Continuous Variable
Central Tendencies for Categorical Variables Understanding Discrete Distributions Performing EDA on Categorical Variables
Dealing with Missing Values Understanding Outliers Identifying Outliers in Data Outlier Detection in Python Outliers Detection Using IQR, Z-score, LOF and DBSCAN
Sample and Population Central Limit Theorem Confidence Interval and Margin of Error
Bivariate Analysis Introduction
Covariance Pearson Correlation Spearman's Correlation & Kendall's Tau Correlation versus Causation Tabular and Graphical methods for Bivariate Analysis Performing Bivariate Analysis on Continuous-Continuous Variables
Tabular and Graphical methods for Continuous-Categorical Variables Introduction to Hypothesis Testing P-value Two sample Z-test T-test T-test vs Z-test Performing Bivariate Analysis on Continuous-Catagorical variables
Chi-Squares Test Bivariate Analysis on Categorical Categorical Variables
Multivariate Analysis A Comprehensive Guide to Data Exploration The Data Science behind IPL
Supervised Learning vs Unsupervised Learning Reinforcement Learning Generative and Descriminative Models Parametric and Non Parametric model
Machine Learning Pipeline Preparing Dataset Build a Benchmark Model: Regression Build a Benchmark Model: Classification
Evaluation Metrics for Machine Learning Everyone should know Confusion Matrix Accuracy Precision and Recall AUC-ROC Log Loss R2 and Adjusted R2
Dealing with Missing Values Replacing Missing Values Imputing Missing Values in Data Working with Categorical Variables Working with Outliers Preprocessing Data for Model Building
Understanding Cost Function Understanding Gradient Descent Math Behind Gradient Descent Assumptions of Linear Regression Implement Linear Regression from Scratch Train Linear Regression in Python Implementing Linear Regression in R Diagnosing Residual Plots in Linear Regression Models Generalized Linear Models Introduction to Logistic Regression Odds Ratio Implementing Logistic Regression from Scratch Introduction to Scikit-learn in Python Train Logistic Regression in python Multiclass using Logistic Regression How to use Multinomial and Ordinal Logistic Regression in R ? Challenges with Linear Regression Introduction to Regularisation Implementing Regularisation Ridge Regression Lasso Regression
Introduction to K Nearest Neighbours Determining the Right Value of K in KNN Implement KNN from Scratch Implement KNN in Python
Bias Variance Tradeoff Introduction to Overfitting and Underfitting Visualizing Overfitting and Underfitting Selecting the Right Model What is Validation? Hold-Out Validation Understanding K Fold Cross Validation
Introduction to Feature Selection Feature Selection Algorithms Missing Value Ratio Low Variance Filter High Correlation Filter Backward Feature Elimination Forward Feature Selection Implement Feature Selection in Python Implement Feature Selection in R
Introduction to Decision Tree Purity in Decision Tree Terminologies Related to Decision Tree How to Select Best Split Point in Decision Tree? Chi-Squares Information Gain Reduction in Variance Optimizing Performance of Decision Tree Train Decision Tree using Scikit Learn Pruning of Decision Trees
Introduction to Feature Engineering Feature Transformation Feature Scaling Feature Engineering Frequency Encoding Automated Feature Engineering: Feature Tools
Introduction to Naive Bayes Conditional Probability and Bayes Theorem Introduction to Bayesian Adjustment Rating: The Incredible Concept Behind Online Ratings! Working of Naive Bayes Math behind Naive Bayes Types of Naive Bayes Implementation of Naive Bayes
Understanding how to solve Multiclass and Multilabled Classification Problem Evaluation Metrics: Multi Class Classification
Introduction to Ensemble Techniques Basic Ensemble Techniques Implementing Basic Ensemble Techniques Finding Optimal Weights of Ensemble Learner using Neural Network Why Ensemble Models Work well?
Introduction to Stacking Implementing Stacking Variants of Stacking Implementing Variants of Stacking Introduction to Blending Bootstrap Sampling Introduction to Random Sampling Hyper-parameters of Random Forest Implementing Random Forest Out-of-Bag (OOB) Score in the Random Forest IPL Team Win Prediction Project Using Machine Learning Introduction to Boosting Gradient Boosting Algorithm Math behind GBM Implementing GBM in python Regularized Greedy Forests Extreme Gradient Boosting Implementing XGBM in python Tuning Hyperparameters of XGBoost in Python Implement XGBM in R/H2O Adaptive Boosting Implementing Adaptive Boosing LightGBM Implementing LightGBM in Python Catboost Implementing Catboost in Python
Different Hyperparameter Tuning methods Implementing Different Hyperparameter Tuning methods GridsearchCV RandomizedsearchCV Bayesian Optimization for Hyperparameter Tuning Hyperopt
Understanding SVM Algorithm SVM Kernels In-depth Intuition and Practical Implementation SVM Kernel Tricks Kernels and Hyperparameters in SVM Implementing SVM from Scratch in Python and R
Introduction to Principal Component Analysis Steps to Perform Principal Compound Analysis Computation of Covariance Matrix Finding Eigenvectors and Eigenvalues Implementing PCA in python Visualizing PCA A Brief Introduction to Linear Discriminant Analysis Introduction to Factor Analysis
Introduction to Clustering Applications of Clustering Evaluation Metrics for Clustering Understanding K-Means Implementation of K-Means in Python Implementation of K-Means in R Choosing Right Value for K Profiling Market Segments using K-Means Clustering Hierarchical Clustering Implementation of Hierarchial Clustering DBSCAN Defining Similarity between clusters Build Better and Accurate Clusters with Gaussian Mixture Models
Understand Basics of Recommendation Engine with Case Study
8 Ways to Improve Accuracy of Machine Learning Models
Introduction to Dask Working with CuML
Introduction to Machine Learning Interpretability Framework and Interpretable Models model Agnostic Methods for Interpretability Implementing Interpretable Model Understanding SHAP Out-of-Core ML Introduction to Interpretable Machine Learning Models Model Agnostic Methods for Interpretability Game Theory & Shapley Values
Introduction to Machine Learning Interpretability Framework and Interpretable Models model Agnostic Methods for Interpretability Implementing Interpretable Model Understanding SHAP Out-of-Core ML Introduction to Interpretable Machine Learning Models Model Agnostic Methods for Interpretability Game Theory & Shapley Values
Introduction to AutoML Implementation of MLBox Introduction to PyCaret TPOT Auto-Sklearn EvalML
Pickle and Joblib Introduction to Model Deployment
Deploying Machine Learning Model using Streamlit Deploying ML Models in Docker Deploy Using Streamlit Deploy on Heroku Deploy Using Netlify Introduction to Amazon Sagemaker Setting up Amazon SageMaker Using SageMaker Endpoint to Generate Inference Deploy on Microsoft Azure Cloud Introduction to Flask for Model Deploying ML model using Flask
Model Deployment in Android Model Deployment in Iphone

Heart Disease Prediction using Machine Learning

Aman Preet
Aman Preet Last Updated : 19 Mar, 2024
7 min read

This article was published as a part of the Data Science Blogathon.

Overview

In this article, we will be closely working with the heart disease prediction using Machine Learning and for that, we will be looking into the heart disease dataset from that dataset we will derive various insights that help us know the weightage of each feature and how they are interrelated to each other but this time our sole aim is to detect the probability of person that will be affected by a savior heart problem or not.

Heart Disease Prediction
Image source: Fifty-plus life

Takeaways

The Heart Disease prediction will have the following key takeaways:

  1. Data insight: As mentioned here we will be working with the heart disease detection dataset and we will be putting out interesting inferences from the data to derive some meaningful results.
  2. EDA: Exploratory data analysis is the key step for getting meaningful results.
  3. Feature engineering: After getting the insights from the data we have to alter the features so that they can move forward for the model building phase.
  4. Model building: In this phase, we will be building our Machine learning model for heart disease detection.

So let’s get started!

Table of contents

What is Heart Disease Predication Using Machine Learning?

Heart disease prediction using machine learning involves analyzing medical information like age, blood pressure, and cholesterol levels to forecast the likelihood of someone having heart issues. By training computer models with this data, we can create systems that help identify individuals at risk of heart disease, aiding in prevention and early intervention.

How Much Machine Learning Is Useful in Disease Prediction?

Using machine learning for disease prediction involves teaching computers to study lots of medical information to guess if someone might get sick. For example, with heart disease prediction using machine learning, computers can look at factors like age, blood pressure, and cholesterol levels to guess who might have heart problems in the future. This helps doctors catch issues early and keep people healthy.

Importing Necessary Libraries

Data Loading

Plotting Librariesimport pandas as pd import numpy as np import matplotlib.pyplot as plt import seaborn as sns import cufflinks as cf %matplotlib inline

Metrics for Classification techniquefrom sklearn.metrics import classification_report,confusion_matrix,accuracy_score

Scalerfrom sklearn.preprocessing import StandardScaler from sklearn.model_selection import RandomizedSearchCV, train_test_split

Model buildingfrom xgboost import XGBClassifier from catboost import CatBoostClassifier from sklearn.ensemble import RandomForestClassifier from sklearn.neighbors import KNeighborsClassifier from sklearn.svm import SVC

Data Loading

Here we will be using the pandas read_csv function to read the dataset. Specify the location of the dataset and import them.

Importing Datadata = pd.read_csv(“heart.csv”) data.head(6) # Mention no of rows to be displayed from the top in the argument

Output:

Exploratory Data Analysis

Now, let’s see the size of the datasetdata.shape

Output:(303, 14)

Inference: We have a dataset with 303 rows which indicates a smaller set of data.

As above we saw the size of our dataset now let’s see the type of each feature that our dataset holds.

Python Code:

Inference: The inference we can derive from the above output is:

  • Out of 14 features, we have 13 int types and only one with the float data types.
  • Woah! Fortunately, this dataset doesn’t hold any missing values.

As we are getting some information from each feature so let’s see how statistically the dataset is spread.data.describe()

Output:

Exploratory Data Analysis

It is always better to check the correlation between the features so that we can analyze that which feature is negatively correlated and which is positively correlated so, Let’s check the correlation between various features.plt.figure(figsize=(20,12)) sns.set_context(‘notebook’,font_scale = 1.3) sns.heatmap(data.corr(),annot=True,linewidth =2) plt.tight_layout()

Output:

output , heart disease prediction using Machine learning

By far we have checked the correlation between the features but it is also a good practice to check the correlation of the target variable.

So, let’s do this!sns.set_context(‘notebook’,font_scale = 2.3) data.drop(‘target’, axis=1).corrwith(data.target).plot(kind=’bar’, grid=True, figsize=(20, 10), title=”Correlation with the target feature”) plt.tight_layout()

Output:

Correlation with the Target Feature ,

Inference: Insights from the above graph are:

  • Four feature( “cp”, “restecg”, “thalach”, “slope” ) are positively correlated with the target feature.
  • Other features are negatively correlated with the target feature.

So, we have done enough collective analysis now let’s go for the analysis of the individual features which comprises both univariate and bivariate analysis.

Age(“age”) Analysis

Here we will be checking the 10 ages and their counts.plt.figure(figsize=(25,12)) sns.set_context(‘notebook’,font_scale = 1.5) sns.barplot(x=data.age.value_counts()[:10].index,y=data.age.value_counts()[:10].values) plt.tight_layout()

Output:

Age Analysis| Heart Disease Prediction

Inference:  Here we can see that the 58 age column has the highest frequency.

Let’s check the range of age in the dataset.minAge=min(data.age) maxAge=max(data.age) meanAge=data.age.mean() print(‘Min Age :’,minAge) print(‘Max Age :’,maxAge) print(‘Mean Age :’,meanAge)

Output:

Output | Heart Disease Prediction

Min Age : 29 Max Age : 77 Mean Age : 54.366336633663366

We should divide the Age feature into three parts – “Young”, “Middle” and “Elder”Young = data[(data.age>=29)&(data.age<40)] Middle = data[(data.age>=40)&(data.age<55)] Elder = data[(data.age>55)] plt.figure(figsize=(23,10)) sns.set_context(‘notebook’,font_scale = 1.5) sns.barplot(x=[‘young ages’,’middle ages’,’elderly ages’],y=[len(Young),len(Middle),len(Elder)]) plt.tight_layout()

Output:

Heart Disease Prediction

Inference: Here we can see that elder people are the most affected by heart disease and young ones are the least affected.

To prove the above inference we will plot the pie chart.colors = [‘blue’,’green’,’yellow’] explode = [0,0,0.1] plt.figure(figsize=(10,10)) sns.set_context(‘notebook’,font_scale = 1.2) plt.pie([len(Young),len(Middle),len(Elder)],labels=[‘young ages’,’middle ages’,’elderly ages’],explode=explode,colors=colors, autopct=’%1.1f%%’) plt.tight_layout()

Output:

Sex(“sex”) Feature Analysis

Sex feature analysis | Heart Disease Prediction

plt.figure(figsize=(18,9)) sns.set_context(‘notebook’,font_scale = 1.5) sns.countplot(data[‘sex’]) plt.tight_layout()

Output:

Inference: Here it is clearly visible that, Ratio of Male to Female is approx 2:1.

Now let’s plot the relation between sex and slope.plt.figure(figsize=(18,9)) sns.set_context(‘notebook’,font_scale = 1.5) sns.countplot(data[‘sex’],hue=data[“slope”]) plt.tight_layout()

Output:

Output of Sex Analysis,

Inference: Here it is clearly visible that the slope value is higher in the case of males(1).

Chest Pain Type(“cp”) Analysis

plt.figure(figsize=(18,9)) sns.set_context(‘notebook’,font_scale = 1.5) sns.countplot(data[‘cp’]) plt.tight_layout()

Output:

Chest Pain

Inference: As seen, there are 4 types of chest pain

  1. status at least
  2. condition slightly distressed
  3. condition medium problem
  4. condition too bad

Analyzing cp vs target column

Heart Disease Prediction

Inference: From the above graph we can make some inferences,

  • People having the least chest pain are not likely to have heart disease.
  • People having severe chest pain are likely to have heart disease.

Elderly people are more likely to have chest pain.

Thal Analysis

plt.figure(figsize=(18,9)) sns.set_context(‘notebook’,font_scale = 1.5) sns.countplot(data[‘thal’]) plt.tight_layout()

Output:

Thal Analysis

Target

plt.figure(figsize=(18,9)) sns.set_context(‘notebook’,font_scale = 1.5) sns.countplot(data[‘target’]) plt.tight_layout()

Output:

Target | Heart Disease Prediction

Inference: The ratio between 1 and 0 is much less than 1.5 which indicates that the target feature is not imbalanced. So for a balanced dataset, we can use accuracy_score as evaluation metrics for our model.

Feature Engineering

Now we will see the complete description of the continuous data as well as the categorical datacategorical_val = [] continous_val = [] for column in data.columns: print(“——————–“) print(f”{column} : {data[column].unique()}”) if len(data[column].unique()) <= 10: categorical_val.append(column) else: continous_val.append(column)

Output:

Feature Engineering Output | Heart Disease Prediction

Now here first we will be removing the target column from our set of features then we will categorize all the categorical variables using the get dummies method which will create a separate column for each category suppose X variable contains 2 types of unique values then it will create 2 different columns for the X variable.categorical_val.remove(‘target’) dfs = pd.get_dummies(data, columns = categorical_val) dfs.head(6)

Output:

Output | Heart Disease Prediction

Now we will be using the standard scaler method to scale down the data so that it won’t raise the outliers also dataset which is scaled to general units leads to having better accuracy.sc = StandardScaler() col_to_scale = [‘age’, ‘trestbps’, ‘chol’, ‘thalach’, ‘oldpeak’] dfs[col_to_scale] = sc.fit_transform(dfs[col_to_scale]) dfs.head(6)

Output:

Output | Heart Disease Prediction

Modeling

Splitting our DatasetX = dfs.drop(‘target’, axis=1) y = dfs.target X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.3, random_state=42)

The KNN Machine Learning Algorithm

knn = KNeighborsClassifier(n_neighbors = 10) knn.fit(X_train,y_train) y_pred1 = knn.predict(X_test) print(accuracy_score(y_test,y_pred1))

Output:0.8571428571428571

Conclusion on Heart Disease Prediction

1. We did data visualization and data analysis of the target variable, age features, and whatnot along with its univariate analysis and bivariate analysis.

2. We also did a complete feature engineering part in this article which summons all the valid steps needed for further steps i.e.
model building.

3. From the above model accuracy, KNN is giving us the accuracy which is 89%.

Conclusion

Heart disease prediction using machine learning utilizes algorithms to analyze medical data like age, blood pressure, and cholesterol levels, aiding in early detection and prevention. Machine learning greatly enhances disease prediction by analyzing large datasets, identifying patterns, and making accurate forecasts, ultimately improving healthcare outcomes and saving lives.

Here’s the repo link to this article. Hope you liked my article on Heart disease detection using ML. If you have any opinions or questions, then comment below.

Frequently Asked Questions

Q1. Which algorithm is best for heart disease prediction?

The best algorithm for heart disease prediction using machine learning is logistic regression, decision trees, and random forests, but popular ones also include logistic regression, decision trees, and random forests.

Q2. What is the machine learning model to detect heart attack?

A standard machine learning model to detect heart attacks is the convolutional neural network (CNN), which analyzes medical images like electrocardiograms (ECGs) to identify signs of a heart attack.

Q3.How to detect heart attack using AI?

Heart attacks can be detected using AI by training machine learning models with medical data, such as ECGs, patient history, and vital signs, to recognize patterns indicative of a heart attack.

Q4.Can a machine detect heart attack?

Yes, machines can detect heart attacks using advanced algorithms and medical data, making early detection possible and aiding in timely medical intervention.

Read on AV Blog about various predictions using Machine Learning.

Hope you liked my article on Heart Disease Prediction using machine learning project ? You can access my other articles, which are published on Analytics Vidhya as a part of the Blogathon link.

The media shown in this article is not owned by Analytics Vidhya and are used at the Author’s discretion. 

 

AlgorithmblogathonHEART DISEASE PREDITIONKNNmachine learning
Aman Preet
Aman Preet

Free Courses

Generative AI 4.7

Generative AI - A Way of Life

Explore Generative AI for beginners: create text and images, use top AI tools, learn practical skills, and ethics.
Large Language Models 4.5

Getting Started with Large Language Models

Master Large Language Models (LLMs) with this course, offering clear guidance in NLP and model training made simple.
Prompt Engineering 4.6

Building LLM Applications using Prompt Engineering

This free course guides you on building LLM apps, mastering prompt engineering, and developing chatbots with enterprise data.
LlamaIndex 4.8

Improving Real World RAG Systems: Key Challenges & Practical Solutions

Explore practical solutions, advanced retrieval strategies, and agentic RAG systems to improve context, relevance, and accuracy in AI-driven applications.
RAG systems using LlamaIndex 4.7

Microsoft Excel: Formulas & Functions

Master MS Excel for data analysis with key formulas, functions, and LookUp tools in this comprehensive course.

Recommended Articles

Responses From Readers

Clear

Tsengel
Tsengel

How we will be using the standard scaler method to scale down the data so that it won’t raise the outliers also dataset which is scaled to general units leads to having better accuracy.

123

Angelina
Angelina

I love to read your thoughts and really admire your views. Thanks for sharing this nice information.

123

Write for us

Write, captivate, and earn accolades and rewards for your work
  • Reach a Global Audience
  • Get Expert Feedback
  • Build Your Brand & Audience
  • Cash In on Your Knowledge
  • Join a Thriving Community
  • Level Up Your Data Science Game
imag
Congratulations, You Did It!
Well Done on Completing Your Learning Journey. Stay curious and keep exploring!
Machine Learning for Heart Disease Prediction
Machine Learning for Heart Disease Prediction
Heart Disease Prediction using Machine learning
Heart Disease Prediction using Machine learning

We use cookies essential for this site to function well. Please click to help us improve its usefulness with additional cookies. Learn about our use of cookies in our Privacy Policy & Cookies Policy.

Show details