I do adapt to ticker changes. If one stock disappears, I erase it.
Sometimes, I add new stocks in the database. These additions/deletions have a small impact on the general signal, but at some point I recalculated the past signals considering only the newest tickers, and I barely saw any difference in the 20DMF signals. The big stocks like AAPL and XOM will not be removed soon. So the issue is with smaller stocks and since there are about 7 to 10 stocks in each sector, and since there are almost 100 sectors, each of these stocks would not weight more than 0.1% to 0.2% of the total result "in strength", but I am calculating an equilibrium and not a strength. So impact on the indicator is almost invisible to the naked eye.

What has more influence is for example when a company like HK is bought out, because this attracts money in all the other Nat-gas companies. So, at some point HK will be erased, but it had its biggest influence when it was bought out and not when it will finally be removed out of the sectors when the buy-out will be official

Pascal.