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Intra-speaker variability is present even when the talker is uttering the same words in the same social and linguistic context. Studies have revealed that such intra-speaker trial-to-trial variability is connected to speech perception and is actively regulated during speech production. However, the relevant parameters in the variability that are under active regulation remain largely unclear. This study contributes to the discussion by examining the distributional properties of intra-speaker variability. Following up on a study that showed formants on hundreds of repetitions of the same word, measured at different points along the trajectory, are all normally distributed, we ask if those normal distributions correspond, i.e. whether a particular repetition would hold a stable position in the distributions across measurement points. Our analysis of 300 repetitions of /i, oU/ showed that strong correspondence typically spans one to two measurement points, and the strength of correspondence is phonemedependent and position sensitive.