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Meaning of day 0 in cohort analysis

Visitor ✭ ✭ ✭
# 1
Visitor ✭ ✭ ✭

I am trying to understand the meaning of day 0 in any cohort table.
Suppose I instrument a simple event "BUY NOW" for users who click on buy now on my website.

Now I want to figure out how many days does it take for a user to start buying on my website. For that I create my segment, choose users in the metric, and create an appropriate cohort.
Now I notice that the total users in the segment (first column in the table) is almost the same as week 0 numbers (or day 0 or month 0)?
This does not make sense. I am pretty sure it takes more than the 1st week for users to start purchasing.
What am I missing ?


1 Expert replyverified_user

Re: Meaning of day 0 in cohort analysis

Rising Star
# 2
Rising Star
If I choose a Cohort Date Range of Last 7 days, and today is February 6, Google Analytics will look from Jan 30 to Feb 6 and align the data based on each user’s Acquisition Date. Here’s how Google Analytics would create the various ‘Days’ of data based on a user Acquisition date of January 30.

Day 0 = Jan 30
Day 1 = Jan 31
Day 2 = Feb 01
Day 3 = Feb 02
Day 4 = Feb 03
Day 5 = Feb 04
Day 6 = Feb 05
Day 7 = Feb 06

See full article here