##Statistics Seminar##\\ Department of Mathematical Sciences ~~META:title =November 13, 2014~~ | **DATE:**|Thursday, November 13, 2014 | | **TIME:**|1:15pm to 2:15pm | | **PLACE:**|OW 100E | | **SPEAKER:**| Withanage A. De Mel (Binghamton University) | | **TITLE:**|Chi-Squared Goodness of Fit Test Based on Random Cells with Recurrent Event Data | \\ **Abstract**We consider a recurrent event wherein the inter-event time distribution $F$ is assumed to belong to some parametric family of the distributions $\mathcal{F},$ where the unknown parameter $\theta$ is $q$-dimensional. This work deals with the problem of goodness-of-fit test for $F.$ We develop a chi-square type test where the $k$ nonoverlapping cell boundaries are randomly chosen. Our test used a Kaplan Meier type nonparametric maximum likelihood estimator (NPMLE) of $F$ to obtain the observed frequencies. The minimum distance estimator of $\theta$ is obtained by minimizing the quadratic form that resulted from the properly scaled vector of differences between the observed and expected cell frequencies. The proposed chi-square test statistic is constructed by using the NPMLE of $F$ and the minimum distance estimator. We show that the proposed test statistic is asymptotically chi-square with $k - q -1$ degrees of freedom. Results for specific families of distributions such as Weibull and Exponential are presented. We also discuss results of a simulation study as well as application to a biomedical data set.