I agree with most of the above comments, missing the worst days would generate a far higher out-performance. This should have been included in this article as it is misleading in its current form.

We all know that timing the market is as hard as stock picking. If you do well then you got lucky and this won't last forever. The dollar cost averaging is usually the best solution here. If you can accumulate cash or lower your exposures in order to invest in every significant dips, then you will outperform over the long term.