If you are asking about how big a rally has to be to make the bottom "real" then the extreme upper bound will be a rally big enough to get the market back to an all-time high : )
What the regression shows us is a "soft" bottom estimate for a rally you may not be able to trust (i.e., you still may have further down to go). So, in between the regression line and the rally needed for an all-time high is an increasing confidence interval that you are past the market bottom.
Good read! What’s the stat for the big enough rally ?
If you are asking about how big a rally has to be to make the bottom "real" then the extreme upper bound will be a rally big enough to get the market back to an all-time high : )
What the regression shows us is a "soft" bottom estimate for a rally you may not be able to trust (i.e., you still may have further down to go). So, in between the regression line and the rally needed for an all-time high is an increasing confidence interval that you are past the market bottom.