Hi I am trying to implement the weighted median polish method described in Cressie, Statistics for Spatial Data Revised Ed' page 398. The median polish bit looks simple but I can't understand the weighting described in section 3.3.13, p147. Sadly I don't have access to either of the referenced papers. Could anyone explain the weighting to me so I can impliment the method in R, or does anyone have some R code for this? Many thanks Dave __________________________________________________ Yahoo! Plus For a better Internet experience http://www.yahoo.co.uk/btoffer