Using Filters Trend, Time and Text

[Erasmo]

Good Afternoon

I would like to know:

1 - What is a "Trend filter" and what application for it?

2 - What diference between "Relative" and "Between"? and what application for it

3 - What diference between "Is Empty" and "Is String Empty".

Thanks

Erasmo

[FernandoUrrutia]

Is important says like trend is not "strict" and is "relative", is not exact in other words.