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Informations about the package imputer

Build Status Latest Stable Version

Imputer

A library for filling in missing data by applying strategies. Inspired by php-ai/php-ml.

Installation

Usage

Imputer works by taking a list of array keys, and a partial set of values, then filling in the gaps. A gap is any key which exists in the key list, which doesn't have a corresponding value.

Say we had a set of incomplete data;

We can apply a linear interpolation to guess at what the values in between might be;

The result will be a completed set of data;

Strategies

Out of the box Imputer provides a few basic strategies. You can write your own by implementing the Imputer\Strategy interface.

Linear Interpolation

As described above, the LinearInterpolation strategy will generate a number of steps between the previous and next known values.

e.g. 3 steps between 1.0 and 3.0 will create [1.5, 2.0, 2.5]

Weighted Interpolation

Similar to the LinearInterpolation strategy, it will interpolate missing values, but with the added capability of applying a weight to each result. This can be useful for applying historical trends to computed data or when you don't want a straight line between points on your graph.

Will result in the following;

Substitution

The Substitution strategy will take an existing set of values and use them to fill in any gaps.

Will result in the following;

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