StepwiseFactorsIdentifier

class qf_lib.common.utils.factorization.factors_identification.stepwise_factor_identifier.StepwiseFactorsIdentifier(epsilon: float = 0.05, is_intercept: bool = True)

Bases: FactorsIdentifier

Class used for identifying factors in the model with Stepwise Regression (with Forward Feature Selection).

Parameters:

• epsilon – minimal improvement of model. If adding next factor doesn’t imporve the score by epsilon, then the algorithm is stopped and new factor is not added.

• is_intercept – True if the output model shall include the intercept, False otherwise (e.g. because data is centered already).

Methods:

select_best_factors(regressors_df, analysed_tms)

Returns the dataframe which is the subset of the original regressors_df but only contains rows for dates common for it and analysed_tms and only contains columns for coefficients which should be included in the model.

select_best_factors(regressors_df: QFDataFrame, analysed_tms: QFSeries) → QFDataFrame

Returns the dataframe which is the subset of the original regressors_df but only contains rows for dates common for it and analysed_tms and only contains columns for coefficients which should be included in the model. Factors are identified using Stepwise algorithm.

Parameters:

• regressors_df – dataframe containing data for regressors (e.g. daily log-returns)

• analysed_tms – timeseries of analysed data (data which should be modeled with regressors, e.g. daily log-returns)

Returns:

Subset of the original regressors_df. Only contains rows corresponding to dates common for it and analysed_tms. Only contains columns corresponding to coefficients which should be included in the model

Return type:

QFDataFrame