In any given context, a Russian verb form may be either perfective or imperfective. Perfective aspect signals the completion or result of an action, whereas imperfective does not. Aspect choice is a function of context, and two types of context are distinguished: deterministic and non-deterministic. This paper is part of a larger study whose aim is to arrive at a contextual definition of aspect choice which will include both deterministic and non-deterministic context types. A framework for the examination of aspect choice over a statistically valid corpus is proposed in conjunction with methodically controlled non-deterministic context types. To test the dependence of one grammatical category on another, a suitable scale of measurement and a correct statistical tool must be selected. Out of four scales, ordinal, interval, ratio, and nominal, the latter is selected. The chi-square test is chosen as the statistical tool, due to its flexibility. Application of these tools using a corpus of 100,000 running words recorded from Russian language broadcasts of the Voice of America is described. (Author/CLK)