Nilgiri
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This is contradictory info.
Sri Lanka is better than India?
Pakistani, Bhutan, Nepal worse?
Basically a bunch of doctors come together and give their opinion on how to weight different things. Its a different set of doctors for each study....so that leads to the first big differences (given different weights, components etc).
Then we have the incoming data, depending on the methodology and country in question (specifically institutional credibility), that introduces a whole new level of error envelope. At some point you have to decide where a set of numbers can be taken to have accuracy to the actual situation....this is done in a very cloudy, somewhat arbitrary way in most cases by global agencies (Esp for countries where a lot of raw data and institutional quality is often lacking and there needs to be actual patching/further estimation). Creating estimates within an estimate and losing track of the effect it has on the end creates a hidden cascade effect (and never makes it to the official paper, you need to really dig for it each time)....but its done in the interest of having results between countries. This is actually published in detail in a WHO paper I remember reading must be 10 years ago or more now.
One thing I give credit to world poverty index is at least they put a qualifier in their numbers in saying the cross country comparison is limited (rather the index for each country should be used to compare only with itself over time...and only much more broadly when comparing with others)....but UN is much more keen on its globalist agenda (compared to say WPI) so it pushes for results more compared to ensuring better accuracy overall.