# Logistic Regression Calculator

In statistics, the logistic model (or logit model) is used to model the probability of a certain class or event existing such as pass/fail, win/lose, alive/dead or healthy/sick. This can be extended to model several classes of events such as determining whether an image contains a cat, dog, lion, etc... Each object being detected in the image would be assigned a probability between 0 and 1 and the sum adding to one. Logistic Regression was used in the biological sciences in early twentieth century. It was then used in many social science applications. Logistic Regression is used when the dependent variable(target) is categorical.

In statistics, logistic regression (sometimes called the logistic model or Logit model) is used for prediction of the probability of occurrence of an event by fitting data to a logistic curve. It is a generalized linear model used for binomial regression. Like many forms of regression analysis, it makes use of several predictor variables that may be either numerical or categorical. For example, the probability that a person has a heart attack within a specified time period might be predicted from knowledge of the person's age, sex and body mass index. Logistic regression is used extensively in the medical and social sciences as well as marketing applications such as prediction of a customer's propensity to purchase a product or cease a subscription.

**References:** Bishop, Christopher M.; Pattern Recognition and Machine Learning. Springer; 1st ed. 2006.

- Amos Storkey. (2005). Learning from Data: Learning Logistic Regressors. School of Informatics. Available on: http://www.inf.ed.ac.uk/teaching/courses/lfd/lectures/logisticlearn-print.pdf
- Cosma Shalizi. (2009). Logistic Regression and Newton's Method. Available on: http://www.stat.cmu.edu/~cshalizi/350/lectures/26/lecture-26.pdf
- Edward F. Conor. Logistic Regression. Website. Available on: http://userwww.sfsu.edu/~efc/classes/biol710/logistic/logisticreg.htm
- LogisticRegression, Class

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