# What is logistic regression in data science

Logistic regression is a statistical analysis method used to predict a data value based on prior observations of a data set. … A logistic regression model predicts a dependent data variable by analyzing the relationship between one or more existing independent variables.

## What is logistic regression explain with example?

Logistic regression is a statistical method for predicting binary classes. The outcome or target variable is dichotomous in nature. Dichotomous means there are only two possible classes. For example, it can be used for cancer detection problems. It computes the probability of an event occurrence.

## What is the difference between regression and logistic regression?

Linear RegressionLogistic RegressionIt is based on the least square estimation.It is based on maximum likelihood estimation.

## What is the purpose of logistic regression?

Like all regression analyses, the logistic regression is a predictive analysis. Logistic regression is used to describe data and to explain the relationship between one dependent binary variable and one or more nominal, ordinal, interval or ratio-level independent variables.

## How is logistic regression done?

Logistic regression uses an equation as the representation, very much like linear regression. Input values (x) are combined linearly using weights or coefficient values (referred to as the Greek capital letter Beta) to predict an output value (y).

## Is logistic regression used for regression?

It is an algorithm that can be used for regression as well as classification tasks but it is widely used for classification tasks.

## Why logistic regression is called regression?

Logistic Regression is one of the basic and popular algorithms to solve a classification problem. It is named ‘Logistic Regression’ because its underlying technique is quite the same as Linear Regression. The term “Logistic” is taken from the Logit function that is used in this method of classification.

## Where do you use logistic regression?

Logistic Regression is used when the dependent variable(target) is categorical. For example, To predict whether an email is spam (1) or (0) Whether the tumor is malignant (1) or not (0)

## Is logistic regression supervised or unsupervised?

True, Logistic regression is a supervised learning algorithm because it uses true labels for training. Supervised learning algorithm should have input variables (x) and an target variable (Y) when you train the model .

Is logistic regression is classification or regression?

Logistic regression is a classification algorithm used to assign observations to a discrete set of classes. Some of the examples of classification problems are Email spam or not spam, Online transactions Fraud or not Fraud, Tumor Malignant or Benign.

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## Why logistic regression is very popular?

Logistic regression is a simple and more efficient method for binary and linear classification problems. It is a classification model, which is very easy to realize and achieves very good performance with linearly separable classes. It is an extensively employed algorithm for classification in industry.

## What is logistic regression Tutorialspoint?

Logistic regression is a supervised learning classification algorithm used to predict the probability of a target variable. … It is one of the simplest ML algorithms that can be used for various classification problems such as spam detection, Diabetes prediction, cancer detection etc.

## What are types of logistic regression?

There are three main types of logistic regression: binary, multinomial and ordinal.

## What is linear regression and logistic regression?

Linear Regression uses a linear function to map input variables to continuous response/dependent variables. … Logistic Regression uses a logistic function to map the input variables to categorical response/dependent variables. In contrast to Linear Regression, Logistic Regression outputs a probability between 0 and 1.

## What is output of logistic regression?

The output from the logistic regression analysis gives a p-value of , which is based on the Wald z-score. Rather than the Wald method, the recommended method to calculate the p-value for logistic regression is the likelihood-ratio test (LRT), which for this data gives .