prices are widely expected to fall now that a tax credit for home buyers has expired.

That’s raising concern about a possible double dip in home prices.

National housing prices stopped falling early last year and rose 0.3% over the 12 months ending in February, according to a study by real estate analytics firm CoreLogic.

The firm predicts prices will fall this year before starting to rise again in late 2010. Even so, next February’s prices are likely to be 4.2% lower, it forecasts.