Suppose the following database:
Income <- structure(list(X = 1:30, Education = c(10, 10.4013377926421,
10.8428093645485, 11.2441471571906, 11.6454849498328, 12.0869565217391,
12.4882943143813, 12.8896321070234, 13.2909698996656, 13.732441...
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02.04.2014 / 14:51