# Module std_dev::regression::derived

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**crate feature**only.`regression`

## Expand description

Estimators derived from others, usual `LinearEstimator`

.

These do not (for now) implement `PowerEstimator`

nor `ExponentialEstimator`

because of the requirement of mutable slices instead of immutable ones.

See the docs on the items for more info about how they’re created.

## Functions

- Fits a curve with the equation
`y = a * b^x`

(optionally with an additional subtractive term if any outcome is < 1 and an additive to the`x`

if any predictor is < 1). - Same as
`exponential`

without the`Clone`

requirement for the iterators, but takes a min value. - Convenience-method for
`exponential`

using`OlsEstimator`

. - Fits a curve with the equation
`y = a * x^b`

(optionally with an additional subtractive term if any outcome is < 1 and an additive to the`x`

if any predictor is < 1). - power_ols
`ols`

Convenience-method for`power`

using`OlsEstimator`

.