Volume 1, Issue 4 (2005) | Journal of Mathematics and Statistics

Boosted Regression Estimates of Spatial Data: Pointwise Inference

Marco Di Marzio — 2005-12-31

Journal of Mathematics and Statistics, Published online: 31 December 2005; doi:10.3844/jmssp.2005.257.266

In this study simple nonparametric techniques have been adopted to estimate the trend surface of the Swiss rainfall data. In particular we employed the Nadaraya-Watson smoother and in addition, an ada...

Parsimonious Var Models For Air Pollution Dynamic Analysis

Fontanella lara — 2005-12-31

Journal of Mathematics and Statistics, Published online: 31 December 2005; doi:10.3844/jmssp.2005.267.276

We discuss a framework to obtain temporal predictions for an evolving spatial field regularly sampled in time at arbitrary spatial locations. Difficulties caused by large data sets and the modelling o...

Modelling the Effect of Salinity on the Multivariate Distribution of a Water Quality Index

Daniela cocchi — 2005-12-31

Journal of Mathematics and Statistics, Published online: 31 December 2005; doi:10.3844/jmssp.2005.277.281

Salinity is a tracer of water and nutrient flows and is employed in studies on coastal environment to establish the coastal or remote origins of pollutants and nutrients. The present article analyses ...

A Comparison of Spatio-Temporal Bayesian Models for Reconstruction of Rainfall Fields in a Cloud Seeding Experiment

Sujit k. sahu — 2005-12-31

Journal of Mathematics and Statistics, Published online: 31 December 2005; doi:10.3844/jmssp.2005.282.290

In response to the drought experienced in Southern Italy a rain seeding project has been setup and developed during the years 1989-1994. The initiative was taken with the purpose of applying existing ...

Riemann Estimation for Replicated Environmental Sampling Designs

Lucio Barabesi — 2005-12-31

Journal of Mathematics and Statistics, Published online: 31 December 2005; doi:10.3844/jmssp.2005.291.295

In many environmental surveys the population under study is made up of biological units scattered over a planar region. A variable is considered on each unit and the target parameter generally turns o...

Inverse Correlations for Multiple Time Series and Gaussian Random Fields and Measures of Their Linear Determinism

R.J. Bhansali — 2005-12-31

Journal of Mathematics and Statistics, Published online: 31 December 2005; doi:10.3844/jmssp.2005.296.308

For a discrete-time vector linear stationary process, {X(t)}, admitting forward and backward autoregressive representations, the variance matrix of an optimal linear interpolator of X(t), based on a k...

Linear Smoothing of Noisy Spatial Temporal Series

Valter Di Giacinto — 2005-12-31

Journal of Mathematics and Statistics, Published online: 31 December 2005; doi:10.3844/jmssp.2005.309.321

The main objective of the study is the development of a linear filter to extract the signal from a spatio-temporal series affected by measurement error. We assume that the evolution of the unobservabl...

VAR-models for Predicting Biodiversity

Tonio D. Bettista — 2005-12-31

Journal of Mathematics and Statistics, Published online: 31 December 2005; doi:10.3844/jmssp.2005.322.325

The aim of this work is to introduce a methodology for monitoring diversity of a biological population by using the tool of diversity profiles. In particular, we develop a theory for studying the dive...

Some Fast Methods for Fitting Some One-parameter Spatial Models

R. J. Martin — 2005-12-31

Journal of Mathematics and Statistics, Published online: 31 December 2005; doi:10.3844/jmssp.2005.326.336

It is common in geographic modelling to use a one-parameter spatial model to specify the inverse covariance matrix in terms of I-βW, for some known matrix W. Exact Gaussian maximum likelihood estim...