Try to understand how trend work

[joyNstay]

Hello, I am trying to understand CCI strategy and I have some questions that I cannot answer.

In every strategy there is this code

Code:

 this.trend = {
   direction: 'undefined',
   duration: 0,
   persisted: false,
   adviced: false
 };

My problem is that I cannot be sure what persisted and advice do exactly.
Can anyone help me?