It is quite often in economics that we wish to model a discrete ordered random variable, such as bond ratings, employment status, consumption levels and so on. However, traditional approaches to modelling such a discrete ordered random variable ignore both the potential build-up of zero...

The adverse effects of excessive alcohol consumption are well-known. Of great concern to policy makers is to understand the potentially different drivers for consumers of different levels of alcohol consumption. Using unit record data from the Australian Drug Strategy Household Surveys, this...

We propose a simultaneous model specification procedure for the conditional mean and conditional variance in nonparametric and semiparametric time series econometric models. An adaptive and optimal model specification test procedure is then constructed and its asymptotic properties are...