Here are some ideas for shorts to consider:
Do the Unchanged issues move like Advancers? At tops and bottoms?
Unchanged issues say more Undecided stocks after a decent correction. Do they tend to plunge at beginning of market corrections (Note: you should use ratio to Total issues if looking prior to 2001 decimalization.)
NYHGH 52s (and almost AMHGH) broke above recent ranges, pointing up.
Might not be today, but these seem to be pointing higher , longer term.
Numbers for MA and MACD , are from Morris' "Market Breath Indicators" book, he cited Michael Zahorchak using 5/15 weekly oscillator of NYSI
here is shorter daily
"It requires, obviously, some luck and some good policy."