Nonresponse in longitudinal studies often occurs in a nonmonotone pattern. In the Survey of I ndustrial Research and Development (SIRD), it is reasonable to assume that the nonresponse mechanism is past-value-dependent in the sense that the response propensity of a study variable at time point t depends on response status and observed or missing values of the same variable at time points prior ...

The analysis of telemetry data is common in animal ecological studies. While the collection of telemetry data for individual animals has improved dramatically, the methods to properly account for inherent uncertainties (e.g., measurement error, dependence, barriers to movement) have lagged behind. Still, many new statistical approaches have been developed to infer unknown quantities affecting a...

There are currently two major agencies, the Bureau of Labor Statistics (BLS) and the Bureau of Economic Analysis (BEA), that produce estimates of the cost of shelter for renters and for owners on a regular basis. In addition, the Census Bureau is conducting a nation-wide survey, the American Community Survey (ACS) of rents and owner costs on a rolling five-year basis. This paper explores the fe...

A dividend imputation tax system provides shareholders with a credit (for corporate tax paid) that can be used to offset personal tax on dividend income. This paper shows how to infer the value of imputation tax credits from the prices of derivative securities that are unique to Australian retail markets. We also test whether a tax law amendment that was designed to prevent the trading of imput...

We present a model-based approach for imputing missing person age for the 2000 Census short form. We use a series of easy to implement multiple regression models, first proposed at the 1997 ASA Joint Meetings, to predict the missing age of a person. This paper extends our work by comparing our results with that of the hot-deck method used for the 1990 Census. By using a comprehensive set of inf...

In physics, objects can be divided into rigid and soft objects according to the object deformation capacity. Similarly, geo-object can also be classified into rigid geo-objects (e.g., building, urban) and soft geo-objects (e.g., mudflow, water, soil erosion). There are three types of approaches for 3D GIS modeling, i.e., surface-based, volume-based, and hybrids in terms of geometry. These appro...

The integration of high dimensional geo-visualization, geo-data management, geo-process modeling and computation, geospatial analysis, and geo-collaboration is a trend in GIScience. The technical platform that matches the trend forms a new framework unlike that of GIS and is conceptualized in this paper as a collaborative virtual geographic environment (CVGE). This paper focuses on two key issu...

In this paper we present a simulator for GEO or MEObased communication systems. This simulator implements variable delay and bit error rate simulation and can be used to analyze communication scenarios involving one or more GEO/MEO or LEO spacecrafts and ground stations. First the paper gives a short overview over the original LEO simulator design from which the GEO simulator was derived. Then ...