spectrochempy.MSCTransformer

class MSCTransformer(reference=None, dim='y')[source]

Multiplicative Scatter Correction (MSC) transformer.

Fits a linear regression of each observation against a reference spectrum during fit(), then corrects with \((x - a) / b\) during transform().

Parameters:

  • reference (NDDataset or array-like, optional) – 1-D reference spectrum. If None, the mean spectrum is used.

  • dim (str or int, optional, default:’y’) – Dimension that identifies individual observations (spectra).

reference_[source]

Reference spectrum used for fitting.

Type:

ndarray

a_[source]

Intercepts of the per-observation regressions.

Type:

ndarray

b_[source]

Slopes of the per-observation regressions.

Type:

ndarray

Examples

>>> scaler = scp.MSCTransformer()
>>> scaler.fit(train)
>>> test_msc = scaler.transform(test)

See also

msc

Procedural MSC function.

Methods Summary

fit(dataset)

Learn parameters from dataset.

fit_transform(dataset)

Fit to dataset, then transform it.

inverse_transform(dataset)

Reverse the learned transformation on dataset.

transform(dataset)

Apply the learned transformation to dataset.

Methods Documentation

fit(dataset)[source]

Learn parameters from dataset.

Parameters:

dataset (NDDataset) – Training data.

Returns:

self – The fitted instance.

fit_transform(dataset)[source]

Fit to dataset, then transform it.

Equivalent to self.fit(dataset).transform(dataset) but avoids an intermediate copy when possible.

Parameters:

dataset (NDDataset) – Training data.

Returns:

NDDataset – Transformed dataset.

inverse_transform(dataset)[source]

Reverse the learned transformation on dataset.

Parameters:

dataset (NDDataset) – Data to invert.

Returns:

NDDataset – Dataset in the original space.

Raises:

SpectroChemPyError – If fit() has not been called first.

transform(dataset)[source]

Apply the learned transformation to dataset.

Parameters:

dataset (NDDataset) – Data to transform.

Returns:

NDDataset – Transformed dataset.

Raises:

SpectroChemPyError – If fit() has not been called first.

Examples using spectrochempy.MSCTransformer