1. DoubleML Data Class

DoubleMLData(data, y_col, d_cols[, x_cols, ...])	Double machine learning data-backend.
DoubleMLClusterData(data, y_col, d_cols, ...)	Double machine learning data-backend for data with cluster variables.
DoubleMLPanelData(data, y_col, d_cols, ...)	Double machine learning data-backend for panel data in long format.