Indeksilukusuureella

Indeksilukusuureella, also known as the index of dispersion, is a statistical measure used to assess the variability or dispersion of a dataset. It is particularly useful in the context of count data, such as the number of events occurring in a fixed interval of time or space. The index of dispersion is calculated as the ratio of the variance to the mean of the dataset. A value of 1 indicates that the data is Poisson-distributed, which is characteristic of random events. Values less than 1 suggest underdispersion, implying that the data is more regular or clustered than expected, while values greater than 1 indicate overdispersion, suggesting that the data is more variable or scattered than expected. This measure is widely used in fields such as ecology, epidemiology, and quality control to evaluate the consistency and predictability of events.