Does a new all-time high make a stock market crash more likely?

Whenever the stock market hits a new all-time high investors and analysts become increasingly concerned about the increased likelihood of a correction (a 10% fall). But are these fears unfounded? How has the stock market historically behaved at previous all-time highs?

So I decided to carry out extensive research into the subject exclusively for 80-20 Investor members. Right now the US stock market remains the leading bellwether for global stocks, particularly as it continues to test new all-time highs. So for the purposes of this research I analysed every daily move in the S&P 500 since January 1950. That's over 17,500 trading days!

Since January 1950 the S&P 500 has set 1,260 new all-time highs. So how has the market behaved after it has set one of these all-time highs?

Statistically, the odds that any given day on the S&P 500 will close higher than the previous day (i.e.