I'm doing a favour for a friend and proof reading her thesis, she's turkish but writing in English so I've corrected her tenses where she had alot of mistakes but does this sound right in context with the subject of panel cointegration testing:
Unit root tests are tools to determine the order of intergratedness of a univariate time series
She is a poverty struck student but if I correct it all and it still might not be perfect I'd rather advise her to go to a professional proof reader who knows the subject. I correct science papers too but some times I have to pass them on as I can't understand the subject (genetics for example!)