The Sainte-Laguë formula is used to allocate the 120 proportional seats in parliament. By calculating it out we can see which parties have only just got seats, and which have nearly got another one.

The full table is here: [download id=”4″] , and the edge case seats are:

• 115 National
• 116 Labour
• 117 National
• 118 National
• 119 Labour
• 120 National
• ——
• 121 NZ First
• 122 National
• 123 Greens
• 124 Labour
• 125 National

The summary is that if the specials are roughly similar to the on-the-night count then the most likely party to lose a seat is National, the most likely to gain is NZ First.

That said, the specials are different, some patterns are common as they’re most likely people out of electorate or only recently enrolled. Given the general wisdom that the Greens tend to do well with the specials then one could argue the most likely scenario is the Greens jumping from 123 to 120 and taking a seat off National.

Updated with the content of a comment I made over at The Standard:

If we ignore the whole Christchurch factor (which I am thinking will lead to unusual behaviour in the specials) it would be a pretty safe assumption that National will drop one seat after specials – they have the 120th quotient and a tradition of doing poorly at specials.

Christchurch gives me a headache – specials caused by Christchurch will have to be people still enrolled in Chch but living/voting somewhere else, or people still living in Chch but not in their own electorate. Are they more likely to be the more wealthy (the exodus is reportedly quite strong amongst more well-off professionals who can easily get a job somewhere else)? Or the poorer (given their suburbs were hit worst)?

My gut says that the well-off professionals most likely have a home elsewhere now, and did the mail redirection thing, so got moved to the roll in their new town. The poor are more likely camping out with friends and family, quite possibly within the wider region, so haven’t been moved to another roll yet. So I’m guessing that the effect of the Christchurch quakes will be to swing specials even more toward the left than usual.

Update: here’s the table for the finals: [download id=”5″]