Testing the signifiance of the difference of coefficients between two subsets

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I have data as follows:

DT <- structure(list(ECOST = c(0.0757999242, 0.190333143, 0.066333267, 
0.2074664592, 0.0615332718, 0.1985331348, 0.0757999242, 0.19033


                      
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