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I have a data frame consisting of three columns(name of compund,ppm and frequency).Name contains string values .ppm and frequency contains numeric values with decimal points upto four digits. I have an excel sheet which is like a library.The first column contains the name of compounds and remaining column contains the ppm values of the compound which satisfy certain rules.The number of ppm values

I have a two part question one about statistical theory and the other about implementations in R. Thank you for all help in advance. (1) Am I correct in understanding that Heteroscedasticity is a problem for Generalized Additive Models as it is for standard linear models? I am asking particularly about the GAMs as implemented in the mgcv package. Based upon my online search it seems that some