A study of 1,200 independent investment advisors surveyed by Charles Schwab has found a strong majority of those responding are optimistic about the prospects for improvement in the economy with 72 percent predicting the S&P 500 Index will continue to rise over the next six months and 79 percent approving of the leadership of Federal Reserve Chairman Ben Bernanke.  Most expect the housing market will improve, a significant turnaround from January, although they also believe job losses will continue.