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hi...
a small problem regarding stationary. I have a data set for a period of 41 years (1970-71 to 2010-11). the model is as follows:
y c x1 x2 x3.
can i run a simple OLS model and interpret the results without testing for stationary?
Or is it necessary to test for stationary.

Hi can anyone help... with a brief explanation pl... :(

Whether the variables are stationary or not has implications on the results of the OLS estimates.

If you don't even know whether your variables are stationary or not, how can you have confidence in your results? Using the in-built unit root tests for each variable shouldn't take long.