# Module std_dev::regression::models

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**crate feature**only.`regression`

## Expand description

The models (functions) we can use regression to optimize for.

You can naturally implement these yourself.

## Re-exports

`pub use trig::*;`

## Modules

- Traits and coefficients of trigonometric functions.

## Structs

- The coefficients of a exponential function (
`kb^x`

). - The coefficients of a line.
- The coefficients of a logistic function.
- The length of the inner vector is
`degree + 1`

. - The coefficients of a power (also called growth) function (
`kx^e`

).

## Traits

- Implemented by all estimators yielding an exponential regression.
- Implemented by all estimators yielding a linear 2 variable regression (a line).
- Implemented by all estimators yielding an logistic regression.
- Implemented by all estimators yielding a polynomial regression.
- Implemented by all estimators yielding a power regression.