In standard Russian, all third person pronouns in prepositional constructions must have initial [n]. However, in some dialects, it is not the case. Mikhalevskaya village dialect is characterized with forms without the initial [n], which is one of its dialectal features. However, the language of the speakers is becoming standardized and there are less and less occurrences of dialectal forms. The data set used in this project consists of 1015 observations. It includes the following variables. Output variable is absence or presence of the initial [n] (categorical). Input variables are informants’ ID (categorical), their year of birth (numerical), gender (categorical: male or female), education level (categorical) as well as some variables that characterize prepositional constructions: type (categorical) and frequency (numerical) of the preposition, form (categorical) and case (categorical) of the pronoun. Our hypothesis is that sociolinguistic factors (such as age of the informants, their gender and education) might influence the proportion of dialectal forms.