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...would be drop1, corARMA, drop1,corARMA, til I get a model with all variables significant. If the initial model has many variables, it would be a time-consuming process. Is it proper to do so? If proper, it'll be wonderful if a new function is developed to automatically do so. Thanks, Hanhan Xianglu Han 206 Environmental Health Science University of Georgia 30602 Phone: 706 255 2308 --------------------------------- [[alternative HTML version deleted]]

...ut obviously y[t]~x[t-1] would give a wonderful regression. So, in practice, if we encounter such situation (with no correlation between two variables and no correlation structure in residuals), we should not stop at that. But how can this be diagnosed but by time lag? Am I right in this point? Xianglu Han 206 Environmental Health Science University of Georgia 30602 Phone: 706 255 2308 --------------------------------- [[alternative HTML version deleted]]