Frequency data from corpora partially explain native-speaker ratings and choices in overabundant paradigm cells

If we can operationalize corpus frequency in multiple ways, using absolute values and proportional values, which of them is more closely connected with the behaviour of language users? In this contribution, we examine overabundant cells in morphological paradigms, and look at the contribution that frequency of occurrence can make to understanding the choices speakers make due to this richness. We look at ways of operationalizing the term frequency in data from corpora and native speakers: the proportional frequency of forms (i.e. percentage of time that a variant is found in corpus data considered as a proportion of all variants) and several interpretations of absolute frequency (i.e. the raw frequency of variants in data from the same corpus). Working with data from unmotivated morphological variation in Czech case forms, we show that different instantiations of frequency help interpret the way variation is perceived and maintained by native speakers. Proportional frequency seems most salient for speakers in forming their judgements, while certain types of absolute frequency seem to have a dominant role in production tasks.