I’ve been seeing lots of seasonality type charts on the S&P500 where they take the average return for each day of the year and then create a return curve for the year. The chart often ‘shows’ the sell in May and buy in November flatness of the returns. And then the holiday end of the year run up.
Steven, my trading buddy, sent me yet another chart and I noticed something I had not seen before. A beginning of the year downtrend from January to mid-March. This got me thinking. How much does the start of the data set impact these charts?
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Click here for the spreadsheet.
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