Housing data released Tuesday was mixed, showing home prices jumped while new home sales dropped, prompting renowned economist Robert Shiller to call the housing recovery positive in the short-term, but not without many headwinds. There might even be a bubble, he said.

"One thing that makes it very hard to forecast home prices right now is that we're living in a totally artificial real estate economy," said Shiller, co-creator of the Standard & Poor's/Case-Shiller Index, a widely followed measure of housing prices.