The government's Index of Leading Economic Indicators jumped 0.6 percent in January, another indication the economy is continuing to accelerate into its seventh year of expansion, the Commerce Department said Friday. The 0.6 percent jump in January follows a 0.7 percent increase in December, according to revised estimates based on a new set of indicators the department began using with this month's data. The index is designed to predict how the economy will be doing three to six months down the road and forecasts continued strong economic growth. The signal of strength may be welcome to the Bush administration, which is counting on growth to finance federal budget deficit reduction.