Ask the master to help me change the stock selection formula of boll's laying the track that day.

Boll is a traditional indicator that comes with the system. If you want to use system indicators to select stocks, you need to create a new stock selection formula. The specific steps are as follows:

Function-Expert System-Formula Manager-Conditional Stock Selection Formula-Self-made Index-New.

Stock selection source code:

n:= 26； p:= 2；

LB:=MA (closing, n)-p*STD (closing, n);

Count (C & ltREF(C, 1), 3)>=2? And then what? L & lt=LB？ And then what? C & gtLB；

Do you understand?

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Some systems come with them? Boll bollinger band stock selection: (see photo)

Not bad either.