Over the weekend, I went shopping for Halloween decorations. In the store, one of the clerks was wearing a white T-shirt with a puff-paint rendering of the Dow Jones Industrial Average. The line representing prices was the color of blood red, dripping and splashed across the front. When I asked him what it was, he said "the October Curse."

'Tis the season of stock market adages; those age-old Wall Street platitudes that claim stock prices perform a certain way during certain months of the year. The problem is, such correlations are hardly a guarantee.

Take October, for example. Yes, this month has marked some of the darkest periods in stock market history: 1929, 1987 and on. Historically, however, it's not the worst performing month. For example, the supposed "Halloween Jinx" failed to bring a deathly pallor to stocks in 2008, as the final days of that year's October saw the biggest weekly gain since 1974.

Then there are these familiar saws of seasonal wisdom:

"As Goes The First Week of January, So Goes The Month" -- In the first week of January 2010, the stock market enjoyed a powerful winning streak. Yet, by the end of the month, prices were back in the red, circling the drain of a two-month low.

"Sell In May And Go Away" -- And don't come back 'till St. Leger's Day (September). If investors heeded this wisdom this year, they would have missed one of the strongest uptrends in stocks of the entire year from July to September.

"September Curse" -- If you think October is supposed to be bad, September is widely assumed to take the financial killing cake. Yet this year, U.S. stocks enjoyed their strongest September in 71 years!

Bottom line: Don't "buy" your trading strategy before the trend actually arrives. The choice comes down to old adages, or objective analysis. Pick the latter.

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This article was syndicated by Elliott Wave International and was originally published under the headline October Curse Vs Objective Analysis: The Choice Is Yours. EWI is the world's largest market forecasting firm. Its staff of full-time analysts led by Chartered Market Technician Robert Prechter provides 24-hour-a-day market analysis to institutional and private investors around the world.