We have been collaborating with and sending research updates from Dave Harder for the past few months.
Dave and I (independently and using different methodologies) have done research on the Crash of 1987. Our aim was to attempt to study market trajectory in the presence of twice as many advancing issues compared to declining issues (and vice-versa) for 10 consecutive trading days. When there are twice the numbers of the advancing issues over declining issues, it means that there is lot of strength beneath the surface of the market. As far as we can tell this has only happened a few times.
When it has, the markets have gone up every time for quite a while. It happened in early January 1975, at the end of the 1973-1974 bear market and at the end of August 1982 (two weeks after the end of that bad bear.) It happened again in January 1985 and January 1987 right before a 40% rise. Whether it will be a bear market rally or a new bull remains to be seen. We now need to keep an eye on the A/D data from last Friday, today and tomorrow, as it may prove to be one of the clearest and best signals to show that an intermediate low is in place.