get_siteIDs_with_k_label_repetitions: Get the sitesIDs that have at least k trials for all label level
Description
This function gets the siteIDs that have at least k label level
repetitions. These siteIDs can be used in a datasource to only get data
from sites that have enough label repetitions. For example, one could use
these siteIDs in conjunction with the ds_basic's site_IDs_to_use argument
to only get data from sites that have enough repetitions of each stimulus.