Taken together, the data showed an economy struggling to emerge from a shallow recession, officially pegged as beginning in March, according to economists. Paul McCulley, portfolio manager at the California-based Pimco bond funds, said that any recovery was both slight and tentative. 'The economy is is clearly healing, but we're not out of the convalescent stage,' he said. The danger still existed of a 'double dip,' with growth moderate to strong in the first half of the year and then falling off in the second half. He said that Fed chairman Greenspan should not even talk about raising interest rates this year, but should 'sit on his bottom and do nothing and say he is going to do nothing.'