Sectors that perform well when bought in the beginning of October include banking, computer tech, healthcare. Tech stocks that are depressed, are most profitable when bought at the end of October. In the middle of October, the best performers are materials, pharmaceuticals while oil performs well if bought at the end of October.
The second week of October tends to be strongly bullish, and the monday before October expiration, on the 15th this year, the dow has been up 25 of the last 31 years. However, on expiration day, the dow is down six straight and seven of the last eight.