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The S&P 500 is in the early stages of a correction: Day trader

Day trader patient amid selling

The S&P 500 could be in the early innings of a correction, professional day trader Lawrence Altman said Friday on CNBC.

"It seems like in all uptrends, the market never goes down very much, but in all downtrends, you get these vicious rallies," he said. "They go up very quickly on no volume, and you just have to be patient."

On CNBC's "Halftime Report," Altman of CBD Trading noted that the stock market was "fighting to rally back," but every time the S&P futures get near 1,830, "they get rejected."