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julien13b1's avatar
julien13b1
New Member
5 years ago

cohort analysis

hi team,

 

i have too create a cohort analysis.

 

my variable is number of book seel each books. some of these books can have a downgrade or a upgrade.

the process of writing and publish the book can take until a year.

 

also i want for instance for those books sold in january 2020, what was the retention each month.

 

any tips or help please

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