Hi everybody, I used randomForest to regress invertebrates abundances in least impaired river reaches from some environmental parameters. Then I used these models to predict invertebrates abundances in impaired reaches.
Now I would like to model the deviation (observation - prediction) with a set of chemical parameters to see if the deviations from predictions could be explained with water chemistry. I did built the model, and I used partialPlot to depict the patterns between individual water chemistry parameters and deviation from prediction. I know that the range and the values indicated on the y-axis do not correspond to the 'raw' deviation. However, since my deviations could be positive (i.e. greater abundance than expected) or negative (i.e. lower abundance than expected), I would like to know if the signs of the y-axis do correspond to those of my deviation values: does a negative value in the y-axis really correspond to a negative value of deviation. Thanks for your help Cédric -- View this message in context: http://r.789695.n4.nabble.com/sign-of-the-y-axis-in-partialPlot-for-randomForest-regression-tp3755583p3755583.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.