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Using PCA to reduce dimensionality

BeginnerGuided Project

Learn how to use Python to apply PCA on a wine data set to demonstrate how to reduce dimensionality within a data set such that you optimize the classification of the wines.

4.5 (64 Reviews)

Language

  • English

Topic

  • Machine Learning

Industries

  • Information Technology

Enrollment Count

  • 249

Skills You Will Learn

  • Python, Machine Learning

Offered By

  • IBMSkillsNetwork

Estimated Effort

  • 20 min

Platform

  • SkillsNetwork

Last Update

  • September 1, 2025
About this Guided Project
This hands-on project is based on the Reducing dimensionality with principal component analysis with Python tutorial. This Guided Project format combines the instructions of the tutorial with the environment to execute these instructions without the need to download, install, and configure tools.

Principal component analysis (PCA) reduces the number of dimensions in large datasets to principal components that retain most of the original information. It does this by transforming potentially correlated variables into a smaller set of variables, called principal components.

A Look at the Project Ahead

In this project, you will:
  1. Explore the data set: Conduct an exploratory data analysis to understand the structure, variable types, and distributions within the wine data set.
  2. Visualize the data: Use pair plots, histograms, and correlation heatmaps to explore the correlations and distributions of the data set's features.
  3. Split the data set: Divide the data set into training and test sets for subsequent modeling.
  4. Standardize the data: Implement feature scaling to standardize the data, ensuring a mean of zero and a standard deviation of one, which is crucial for PCA.
  5. Determine the optimal n_components for PCA: Use explained variance plots and scree plots to identify the ideal number of principal components.
  6. Apply PCA: Reduce the dimensionality of the training data using PCA, focusing on retaining the most variance.
  7. Visualize the PCA output: Create scatter plots to visualize the principal components and observe the separation between different wine types.

What you'll need

A web browser, enthusiasm for learning, 20-30 minutes of free time, and basic Python coding skills. Everything else will be provided.

Instructors

Eda Kavlakoglu

Program Director, Technical Content at IBM

Marketing leader with a technical background in data science.

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Sina Nazeri

Data Scientist at IBM

I am grateful to have had the opportunity to work as a Research Associate, Ph.D., and IBM Data Scientist. Through my work, I have gained experience in unraveling complex data structures to extract insights and provide valuable guidance.

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Contributors

Wojciech "Victor" Fulmyk

Data Scientist at IBM

As a data scientist at the Ecosystems Skills Network at IBM and a Ph.D. candidate in Economics at the University of Calgary, I bring a wealth of experience in unraveling complex problems through the lens of data. What sets me apart is my ability to seamlessly merge technical expertise with effective communication, translating intricate data findings into actionable insights for stakeholders at all levels. Follow my projects to learn data science principles, machine learning algorithms, and artificial intelligence agent implementations.

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