Real GDP is how economists can tell whether there is any real growth between one year and the next It is calculated using goods and services prices from a base year, rather than current pricesAsked by Wiki User 35 36 37 See Answer Top Answer Wiki User AnsweredYou should do the data processing step outside of the model formula/fitting When creating the factor from b you can specify the ordering of the levels using factor(b, levels = c(3,1,2,4,5))Do this in a data processing step outside the lm() call though My answer below uses the relevel() function so you can create a factor and then shift the reference level around to suit as you need to
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