webcal

Description

Statistics Seminar.

Speaker: Ujjwal Das.

Affiliation: IIM Udaipur, Rajasthan.

Date and Time: Tuesday 02 April, 3:30 pm - 4:30 pm.

Venue: Ramanujan Hall, Department of Mathematics.

Title: Inference on zero inflated ordinal models with semiparametric link.

Abstract: In socioeconomic and Biological studies, observations on
individuals are often observed longitudinally on a Likert-type scale with
substantially large proportion of zeros. This leads to a special case of
mixture structured data where extra-variation occurs. Obviously the
standard ordinal data analysis fails to provide appropriate statistical
inference. We propose a suitable zero inflated semi parametric ordinal
model that takes into account the non linear link between the ordinal
response and a covariate. A sieve maximum likelihood estimator(MLE) is
proposed for the regression parameter of interest. We also propose a test
for the zero proportion in this semi parametric model. A simulation study
has been carried out to investigate the performance of the estimator as
well as the test.

Ujjwal Das, IIM Udaipur, Rajasthan