***Column names read me***
**Form** - Version of test (A or B)
**Sentence** - Sentence frame prior to target word
**Prompt** - Stem prompt for target word
**TargetForm** - Target derived word
**WordLength** - Word length in characters
**DerivedWordFreq** - Frequency of the derived word (SUBTLEX-US)
**StemFreq** - Frequency of the stem form (SUBTLEX-US)
**SuffixProd** - Suffix productivity
**DerFamEntropy** - Derivational family entropy
**OLD20** - Leventshtein distance (using the vwr R package)