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...tandard error: 6.688e-17 on 8 degrees of freedom Multiple R-squared: 0.5794, Adjusted R-squared: 0.5269 F-statistic: 11.02 on 1 and 8 DF, p-value: 0.01054 How could this be possible? Did I missing something in my R code? Best, Miles -- －－－－－－－－－－－－－－－－－－ Miles Yang Mobile：+61-411-985-538 E-mail：miles2yang@gmail.com －－－－－－－－－－－－－－－－－－ [[alternative HTML version deleted]]

...hree columns: Period, Aircraft and Total.Employees. And, I got the error message like this: *Error in eval(expr, envir, enclos) : object 'dv1' not found* Could any one tell me what is going on there? Thanks in advance. Miles -- －－－－－－－－－－－－－－－－－－ Miles Yang Mobile：+61-411-985-538 E-mail：miles2yang@gmail.com －－－－－－－－－－－－－－－－－－ [[alternative HTML version deleted]]