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This is the worst week for stocks—historically speaking

If history is any guide, stocks are set to slide.

September is known as a bad month for stocks from a seasonal perspective. It turns out that some technical analysts get even more specific than that. Ryan Detrick of LPL Financial has found that since 1950, the worst week for the S&P 500 has on average been the 38th week in a given year.

This week happens to be the 38th of 2016.

Detrick goes on to point out that the S&P's average return in a year's 38th week is minus 0.61 percent, and that the market has dropped in the 38th week in seven of the eight previous years.

Larry McDonald of ACG Analytics offers a potential explanation: Asset managers who are doing well in a given year may try to "protect gains" amid any glimmer of uncertainty. That is, funds beating the market in a given year will have an extra incentive to sell stocks in order to protect their annual performance number.

Still, McDonald added Monday on CNBC's "Trading Nation" that he "wouldn't put a lot of stock" in the market factoid, preferring instead to look to central bank actions as well as the presidential election to make his broad-market calls.

Zachary Karabell of Envestnet adds that "if patterns were destiny in financial markets, then the only people who would be making a lot of money would be chartists and quants," which does not appear to be the case.

For his part, Detrick writes: "Should this weakness occur, we would not view this as a reason to panic; instead, we would likely consider buying the dip, as we are looking for equities to end the year near current levels."

Stocks didn't suffer a particularly tough beginning to the week; the S&P 500 fell 0.04 points on Monday, its smallest single-day drop since 2012.

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Brian Sullivan is co-anchor of CNBC's "Power Lunch" (M-F,1PM-3PM ET), one of the network's longest running programs, as well as the host of the daily investing program "Trading Nation." He is also a frequent guest on MSNBC's "Morning Joe" and other NBC properties.

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