What does "within" mean in event segment?

Think of it in 2 steps

1. Defining user group
2. Determine events fired by that user group

Step 1

As far as I can tell, “within 1 days” means you’re looking at a group of users who have performed your specified event (Purchase Song or Video >= 1 time) within 1 day of first use.

I’m 90% sure that “first use” means the first event (most likely “[Amplitude] Start Session”)

I’m not entirely sure about the “in the past 90 days” part. My guess is that you’re only looking at “New users” within the past 90 days (excluding those who’ve visited prior).

Step 2

After finding the user group, you’re determining how many users have performed “Play Song or Videos” event (if chart is set to “Uniques”).

About your test user_id 1

Given your 2 events, we can’t determine if the user is included or not. The first event is related to Step 1 whereas the 2nd event is related to Step 2. 

What you need for Step 1 is the timestamp of the very first event of the user + your filtering event (“Purchase Song or Video”). And of course the user needs to be considered “New” within the past 90 days.

That’s my understanding of it, after a bit of digging :) 

@andreas_heden @Saish Redkar 

It’s clear! Thanks all~

But if this is a new feature and I want to take a sample that performed a certain action in a certain period of time before the second stage of the funnel, how can I do it?