The p-value and F-value for lack of fit for my regression model was not given. after diagnosing i discovered it is because the SSPE and MSPE is zero. please what does this imply?
F-tests are not reported in many software packages if the error sum of squares is zero (indicating perfect fit of data to model). In most real-life applications, it's exceedingly rare that such a case would occur. I would guess that the reason has something to do with the data generating function/method you have used. In the absence of any other information, that's as specific a reply as I can give.