Comparison.score.frequency

Calculates the frequency difference between the reference and comparison corpora.

import wordlevel as wl

cl = wl.Catalog.from_dict_of_freqs(
    {
        "before": {"good": 12, "bad": 8, "happy": 6, "sad": 4},
        "after": {"good": 5, "bad": 7, "happy": 3, "sad": 9},
    }
)

cl = cl.with_comparisons(wl.comp("before", "after").score.frequency())

The contribution \(\delta_\tau\) of a token \(\tau\) is the difference in its raw frequency between the corpora:

where \(f_\tau^{(R)}\) and \(f_\tau^{(C)}\) are the raw frequencies of \(\tau\) in the reference corpus \(R\) and the comparison corpus \(C\).

Returns:

Source