Abstract

ROCHA, Marcelo M.; YAMAMOTO, Jorge K.; WATANABE, Jorge  and  FONSECA, Priscilla P.. Studying the influence of a secondary variable in Collocated Cokriging estimates. An. Acad. Bras. Ciênc. [online]. 2012, vol.84, n.2, pp. 335-346.  Epub Apr 03, 2012. ISSN 0001-3765.  http://dx.doi.org/10.1590/S0001-37652012005000017.

In this paper the influence of a secondary variable as a function of the correlation with the primary variable for collocated cokriging is examined. For this study five exhaustive data sets were generated in computer, from which samples with 60 and 104 data points were drawn using the stratified random sampling method. These exhaustive data sets were generated departing from a pair of primary and secondary variables showing a good correlation. Then successive sets were generated by adding an amount of white noise in such a way that the correlation gets poorer. Using these samples, it was possible to find out how primary and secondary information is used to estimate an unsampled location according to the correlation level.

Keywords : collocated cokriging; correlation coefficients; estimation weights; Markov Model Estimation; multivariate geostatistics.