Odp: Regression and data types
Hi r-help-bounces at r-project.org napsal dne 26.09.2008 14:17:59:
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.
try str(X2) it is probably character vector or factor, so you need to transfer it to numeric. see ?as.numeric and beware of factor properties (if X2 is factor) Regards Petr
Please help! Lewis ********************************************************************** Hermes Fund Managers Limited Registered in England No. 1661776, Lloyds Chambers, 1 Portsoken Street,
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