Gini coefficient for number of posts

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with b as (Select count(n_posts) OVER(ORDER BY n_posts+0.000000001*OwnerUserId Desc) users_quantile, 
sum(n_posts) OVER(ORDER BY n_posts+0.000000001*OwnerUserId Desc) posts_quantile
  from 
  (     select count(id) n_posts, datepart(month, CreationDate) monthli, OwnerUserId
        from Posts
        where PostTypeId = 2 and
              datepart(year, CreationDate)=2019 
        group by OwnerUserId, datepart(month, CreationDate)
  ) a 
)


select b.users_quantile, 1.000*b.posts_quantile/(select max(1.000*b.posts_quantile) from b) posts_percentage from b

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