Nikkei edges up but trade cautious before earnings

90-95 yen for the year to March. Sony Corp rose 0.9 percent to 2,675 yen and Olympus Corp gained 1.5 percent to 2,775 yen. Industrial robot maker Fanuc Ltd added 1.3 percent to 8,120 yen. Elpida gained 1.2 percent to 1,399...