## What is BIC model?

The Bayesian Information Criterion (BIC) is an index used in Bayesian statistics to choose between two or more alternative models. The BIC is also known as the Schwarz information criterion (abrv. SIC) or the Schwarz-Bayesian information criteria.

## What is AIC used for?

In plain words, AIC is a single number score that can be used to determine which of multiple models is most likely to be the best model for a given dataset. It estimates models relatively, meaning that AIC scores are only useful in comparison with other AIC scores for the same dataset. A lower AIC score is better.

**What is AIC value?**

The Akaike information criterion (AIC) is an estimator of prediction error and thereby relative quality of statistical models for a given set of data. Given a collection of models for the data, AIC estimates the quality of each model, relative to each of the other models.

### What is K in AIC?

k in AIC is a multiplier for the penalty term for complexity. The usual AIC, as developed by Akaike, used k = 2, so that is the default. In the BIC or SBC, k = log(n), where n is the number of observations.

### What is AIC and BIC in Arima?

As for other regression processes, Akaike Information Criterion (AIC) and Schwarz Bayesian Criterion (SBC), aka Schwarz Information Criterion (SIC) or Bayesian Information Criteria (BIC), can be used for this purpose. Generally, the process with the lower AIC or BIC value should be selected.

**What is the formula of BIC?**

BIC = n * LL + k * log(n)

## How is AIC calculated?

Details. AIC = – 2*log L + k * edf, where L is the likelihood and edf the equivalent degrees of freedom (i.e., the number of parameters for usual parametric models) of fit . For generalized linear models (i.e., for lm , aov , and glm ), -2log L is the deviance, as computed by deviance(fit) .

## What is StepAIC in R?

StepAIC is an automated method that returns back the optimal set of features.