Investors might want to bet on Archrock Inc. (AROC) , as earnings estimates for this company have been showing solid improvement lately. The stock has already gained solid short-term price momentum, and this trend might continue with its still improving earnings outlook.The upward trend in estimate revisions for this natural gas compression services business reflects growing optimism of analysts on its earnings prospects, which should get reflected in its stock price. After all, empirical research shows a s ...