Sigmoid Function

Logistic Regression 1 – Classification, Logistic Regression and Sigmoid Function

In previous series of posts we discussed simple and multivariate linear regression that can be used to predict target features with continuous values. Besides that, there are other prediction problems with categorical target features and we want to train a model so that we can use it to predict the class of unknown data. Logistic regression is one of these models. Classification Problem Imagine we have a tumor dataset which contains the Size of tumor and whether the tumor is Malignant or not.