Dear All I have three data sets, X1, X2 and Y. X1 is data, X2 and Y were generated in (different) R programs. All three vectors have one column of 60 data points. I am using the code lm(Y~X1)$coef and lm(Y~X2)$coef. The first returns two values, an intercept and a slope, but the second returns 60 values. I suspect there is something in the "type" of X2 such that it forces the regression to do something different, but I can't work this out. Please help! Lewis
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