Question: For the reading data in the file read.dat, use the R function rplot to investigate the shape of the regression surface when predicting the 20%

For the reading data in the file read.dat, use the R function rplot to investigate the shape of the regression surface when predicting the 20% trimmed mean of WWISST2 (the data in column 8) with RAN1T1 and RAN2T1 (the data in columns 4 and 5).

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