Very hard to say without a reproducible example. But perhaps "DVI1" is not in your "Trainingset" dataframe?
________________________________ From: R-sig-Geo <[email protected]> on behalf of Enoch Gyamfi Ampadu <[email protected]> Sent: Tuesday, June 9, 2020 14:06 To: Help R-Sig_Geo <[email protected]> Subject: [R-sig-Geo] Coding and addition of explanatory variables Dear List, Please I am doing a biomass analysis with a satellite image. The explanatory variables include the satellite bands and vegetation indices. I am using Random forest regression. I have added bands of the satellite image to the model and it worked. However, when I tried to add the vegetation indices (bands) I get error messages. I have put the codes I am using below; Model <- randomForest(class~ B1 + B2 + B3 + B4 + B5 + B6 + B7 + B8 + B9 + B10 + B11 + B12 + DVI1, data = Trainingset, proximity=TRUE, importance=TRUE). The "DVI1" is the vegetation index variable band I tried to add to the model. Below is the error message I received. "Error in eval(predvars, data, env) : object 'DVI1' not found" I will be glad if I could get some assistance on how to resolve it. Best regards, Enoch -- *Enoch Gyamfi - Ampadu* *Geography & Environmental Sciences* *College of Agriculture, Engineering & Science* *University of KwaZulu-Natal, Westville Campus* *Private Bag X54001* *Durban, South Africa **� 4000**.* *Phone: +27 835 828255* *email: [email protected] <[email protected]>* *skype: enoch.ampadu* *The highest evidence of nobility is self-control*. *A simple act of kindness creates an endless ripple*. [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list [email protected] https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstat.ethz.ch%2Fmailman%2Flistinfo%2Fr-sig-geo&data=02%7C01%7C%7C040a519515414dcf4ff508d80c7e6133%7C8e105b94435e4303a61063620dbe162b%7C0%7C0%7C637273084221502390&sdata=yL%2BLWXZWZ0EaUNEXxLXpWnkkOgKeMriuuuJR47MUIhI%3D&reserved=0 [[alternative HTML version deleted]]
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