# Process transformation¶

The objective here is to create a process as the image through a field function of another process :

**General case**

We build the composite process thanks to function and the process .

**Trend modifications**

(1)¶

The library enables to directly convert the function
into the vertex-value function thanks
to the *TrendTransform* object which maps into the
vertex-value function .

Then, the process is built with the object
*CompositeProcess* from the data: and the process
such that:

**Box Cox transformation**

If the transformation of the process into corresponds to the Box Cox transformation which transforms into a process with stabilized variance, then the corresponding field function is the value function defined by:

(2)¶

*ValueFunction*object.

*CompositeProcess*from the data: and the process such that:

API:

See

`CompositeProcess`

See

`TrendTransform`

See

`BoxCoxFactory`

Examples: