right so if you go er into  squared and estimate the equation, right, it has actually estimated over the full sample period  has it, no it hasn't  no alright it hasn't estimated so that's an equation estimated over the first sum, first sub sample, right, if you press the return key again  right  right, at the bottom in  the table of diagnostic tests you'll see chow's predictive failure test, right and also erm the chow test.