World Banks's Lead time to import data analysis 4 - Lead time variation by region, group, year -- using 'infer' package.
Generated by Bing Image Creator: long landscape view of green fields with blue sky and white clouds. There is phalaenopsis orchid flowers. Photo www.crosshyou.info This post is following of the above post. In the previous post, I see three things, 1. Lead time to import varies by region. 2. Lead ti…
