Data Interview Question

Linearly Separable Data Analysis

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Requirements Clarification & Assessment

Before diving into the solution, it is essential to clarify and assess the requirements of the problem at hand:

  1. Understanding Linearly Separable Data:

    • Definition: Data is said to be linearly separable if there exists a hyperplane that can perfectly separate the data points of different classes without any overlap.
    • Implications: In such datasets, the classes can be perfectly divided by a straight line (in 2D), a plane (in 3D), or a hyperplane (in higher dimensions).
  2. Logistic Regression Basics:

    • Purpose: Logistic regression is a binary classification algorithm that predicts the probability of a binary outcome based on one or more predictor variables.
    • Mechanism: It models the relationship using a logistic function, outputting probabilities between 0 and 1.
  3. Objective:

    • To understand what happens when logistic regression is applied to perfectly linearly separable data.
    • To explore how this affects model convergence, coefficient estimates, and overall performance.
  4. Constraints:

    • The dataset is assumed to be perfectly linearly separable with no noise or overlapping data points.
    • The focus is on logistic regression without any regularization initially.
  5. Expectations:

    • Identify potential issues with logistic regression on such data.
    • Explore solutions to mitigate these issues, if any.