How can different elections become comparable?

Making Different Elections Comparable

TL;DR

The solution is a translation step.

The limits of direct comparison

By this point, two things are clear: projecting the latest election forward does not work, and comparing elections directly does not work either. The problem is not a lack of data. It is that different elections are being treated as if they speak the same language. They do not.

A better question

Instead of asking which election result should be trusted most, the better question is: what does this election result mean in Assembly terms?

Assembly-equivalent vote share

The Assembly election becomes the reference frame. Not because it is more important, but because it is the outcome being estimated. For every non-Assembly result, the question is: what does that result usually translate to in an Assembly election?

Party-specific translation

Here is where the earlier insight matters. The translation is not the same for every alliance. From historical data: LDF tends to gain when moving into Assembly elections. UDF tends to lose. NDA's relationship is more volatile.

ConversionNDAUDFLDF
Lok Sabha → Assembly+0.5%-5.6%+6.8%
Local → Assembly-0.5%+1.6%+5.7%

Historical average offsets. Positive means the alliance does better in Assembly than the source election.

This table shows why a single adjustment cannot work. Each alliance needs its own translation rule.

What this fixes, and what it does not

This translation step makes different elections comparable, respects alliance-specific behavior, and turns raw percentages into meaningful indicators.

The results still need to be combined. Translation provides a better starting point, not the answer.