annotate_prev_word_idx#

pymovements.measure.reading.annotate_prev_word_idx(fixations: DataFrame, group_columns: list[str]) → DataFrame[source]#

Annotate fixations with the word index of the previous fixation.

Parameters:

  • fixations (pl.DataFrame) – Fixation-level DataFrame. Must contain a word_idx column.

  • group_columns (list[str]) – Column names used to partition the data into independent reading sequences.

Returns:

Input DataFrame with an additional prev_word_idx column.

Return type:

pl.DataFrame