Coverage

>>> from techminer2.tools import coverage
>>> coverage(
...     field="author_keywords",
...     #
...     # DATABASE PARAMS:
...     root_dir="example/",
...     database="main",
...     year_filter=(None, None),
...     cited_by_filter=(None, None),
... )
--INFO-- Number of documents : 50
--INFO--   Documents with NA : 12
--INFO--  Efective documents : 38
   min_occ  cum_sum_documents  coverage  cum num items
0       31                 31   81.58 %              1
1        7                 33   86.84 %              2
2        4                 33   86.84 %              3
3        3                 35   92.11 %              7
4        2                 36   94.74 %             25
5        1                 38  100.00 %            148