The database contains the results of a psycholinguistic experiment targeted at variation in the prefix marking of Russian attenuative verbs. The Experiment_Results.xlsx spreadsheet contains all responses from each participant, for target stimuli and for the fillers. No personal information about the participants is included in the files, the informants are identified by numbers from 1 to 122. Experiment_Results.xlsx contains six spreadsheets that include the following information (more detailed descriptions are provided in the file itself): all responses of the informants, prefixes used, whether the prefixes used matched the prefixes in the RNC, the data on frequency, information about the experimental context etc. Statistical analysis was performed using the statistical software R, and statistical code is available in R_script_Chapters_7_8.R The ctree and cforest analyses were performed on the Chapter8_dataset_c_tree_forest.csv file.