Wednesday, December 4 2019
3:30pm - 4:30pm
Masters Presentation
Impact of Block Size on Parameter Estimates of the Generalized Extreme Value Distribution and Goodness-of-fit Test for the Maximum

Extreme Value Theory (EVT) is a branch of statistics that concerns the probability of unlikely events. There are numerous practical applications including hydrology and financial modeling as well as any other event in which a high magnitude event needs to be predicted. The Generalized Extreme Value (GEV) distribution is a commonly used model that uses the largest value within an interval of observations, or block maxima, to generate a distribution of events that occur in the tails of typical distributions. The selection of block size has a large impact on the model because small blocks sizes yield a large sample of less extreme events, and conversely, larger blocks yield a smaller sample of more rare events. When the underlying distribution of the population has the form of a known distribution, the empirical distribution of maxima over the block can be calculated using the distribution of the largest order statistic. The objective of this paper is to use a simulation study to demonstrate that GEV models based on larger block sizes are more similar to the empirical distribution of maximum order statistic than GEV models based on smaller block sizes, but larger block sizes suffer from less stable parameter estimation.
Speaker:Danielle Totten

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