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...without quantifying these factors and assigning different values to factors would not change the fittings as shown: x <- 1:20 ## numeric predictor yes.no <- c("yes","no") factors <- gl(2,10,20,yes.no) ##factor predictor factors.quant <- rep(c(18.8,29.9),c(10,10)) ##quantificatio of factors factors.quant.1 <- rep(c(16.9,38.9),c(10,10)) ##second quantificatio of factors response <- 0.8*x + 18 + factors.quant + rnorm(20) ##response lm.quant <- lm(response ~ x + factors.quant) ##lm with quantifications lm.fact <- lm(response ~ x + factors) ##lm with factors lm...