Thursday and Friday brought a pause to January’s selling, pushing the S&P 500 to its first weekly gain this year. Some investors say now is the time to buy stocks that have been bruised by a broad selloff that has pushed all but two S&P 500 sectors into the red for the year. “There is no doubt that this will be classified as a bear market,” said Doug Ramsey, chief investment officer at Leuthold Weeden Capital Management, which has $1.8 billion in assets under management in Minneapolis.