Nigel Marriott Profile picture
May 8, 2021 8 tweets 4 min read Read on X
WECA Mayor count takes place today covered by @adam_ldr @StephenSumner15

I've updated my forecast based on the PCC counts yesterday (Orig FC here bit.ly/3uqY0Uu). PCC had an IND candidate but WECA doesn't.

My FC of 1st prefs is unchanged, CON lead by 5pts.

But ... /1
... PCC saw 51% of eliminated candidates votes passed to LAB & CON as 2nd prefs.

This is high for an SV election.

I haven't any other SV election exceed 43%. Normally it's less than 40%.

Reason appears to be twofold.

Bristol T/O was higher than expected (54% of WECA) ...

/2
... compared to 51% of WECA in 2017.

Additionally, the Green vote was very good in Bristol & it's very plausible that Green voters are giving Labour 2nd prefs in much higher numbers.

As charts below show, it seems CON 2nd prefs are coming from LD & IND.

For my revised ...

/3
... FC, I've assumed that CON will get 60% of IND PCC votes which is why they still have a 5pt 1st pref lead.

2nd prefs on scale of PCC will give LAB an easy victory.

BTW, 60% of all votes in B&NES in Bristol & 66% in S.Gloucs did not give a 2nd pref or were rejected.

/4
So will LAB win on 2nd prefs or will the CON vote hold up?

Or have WECA voters voted completely differently to their PCC votes in which what I've said here is bollocks!

What will it happen? Hopefully @adam_ldr can keep us updated!

/end
Ok 1st prefs are in.

It's an easy victory for LAB on 2nd prefs.

What's notable is that LAB's vote share was a scenario I looked at but the CON vote share is poor no question.

It would seem B&NES is the council that really delivered for LAB and not for CON here.

@adam_ldr
Worth remembering that the IND candidate from 2017 endorsed the LAB candidate in this election. Is that why CON underperformed and LAB did better than expected?
Updated vote history for WECA here.

LD & GRN in line with my forecast but CON definitely underperformed and LAB benefitted.

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More from @MarriottNigel

Jun 30
How am I forecasting the number of seats each party will win in #GE2024?

By using simultaneous equations!

Specifically I am estimating the Sum and Difference in number of CON & LAB seats won using Sum & Difference in CON & LAB vote shares.

Let me demonstrate…

1/16 Image
Latest polls show average vote shares of CON 20.2% and LAB 40.1%.

The Vote Share Sum CON+LAB is 60.3%.

The Vote Share Difference CON-LAB is -19.9%.

These vote shares are for Great Britain since nearly all polls do not survey in Northern Ireland.

2/16 Image
History shows Vote Share Sum correlates well with the combined share of GB seats won by CON+LAB.

The last 7 elections follow the green line fit.

This predicts Seat Share Sum CON+LAB in 2024 of 87.6% (=0.164*60.1%+77.67%) or 553 seats of 632 GB seats.

3/16 Image
Read 16 tweets
Jun 22, 2023
I've been looking at 3-year excess deaths by country over the last month so this BBC article in relation to #CovidInquiry #Covid_19 is timely.

However, I'm not keen on the way the BBC have presented the #stats, so here is my presentation instead.



...
/1bbc.co.uk/news/health-65…
I agree with the Chief Medical Officer that one should look at Excess Deaths which is what I've done.

My data is not age standardised mostly because I didn't have the time to do this.

All data downloaded from @OurWorldInData .

I compare the UK with 4 countries at a time.

/2
I start with our immediate neighbours Ireland, France, Belgium & Netherlands.

Excess deaths is an estimate (total deaths-avg of last 5 years) so one must allow for some differences to be the result of baseline error.

I've plotted data using scale equal to 2x UK peak.

/3 Image
Read 14 tweets
May 8, 2021
Dan Norris has won #WestOfEnglandMayor for #Labour making it one of the few LAB gains in #LocalElections2021.

In doing so, he also wrecked my forecast (see bit.ly/3uqY0Uu) the Conservatives would just hold on!

So what went wrong?

My...

@adam_ldr @StephenSumner15

/1
... blog makes it clear that my forecast was in fact the minimum CON needed to do to win & was based on a number of assumptions.

The final vote tally saw LAB with 40k votes ahead of CON & crunching the numbers breaks the reason for this into 4 parts.

First an aside.

/2
When analysing elections using Supplementary Vote, it's more correct to look at number of votes rather than vote shares.

That's because there are a number of steps to the final vote totals & errors can multiply along the way.

So the 1st reason for the 40k difference is ...

/3
Read 8 tweets
May 7, 2021
What is the lesson from #HartlepoolByElection for forecasting future elections?

I have 2 hypotheses.

1. Hartlepool was behind the curve in #GE2019 & the by-election represents catch up.
2. #Brexit realignment of British politics is still continuing.

Let's look at them... /1
The 1st can be confirmed just by looking at CON vote share changes between 2010 & 2019 in Hartlepool's 4 neighbours.

Easington > from 14% to 26%
Sedgefield > from 23% to 47%
Stockton N > from 26% to 41%
Redcar > from 14% to 46%
Hartlepool > from 28% to 29%

So the jump ...

/2
... to 52% in this by-election can be put down to #Hartlepool copying its neighbours 2 years late.

But could this indicate the Brexit realignment of 2019 was incomplete & there could be more Hartlepool's?

The answer is yes. Note how nearly all BXP voters went to CON ...

/3
Read 10 tweets
Nov 3, 2020
Parliament votes tomorrow to confirm that England will go into its 2nd #COVID19 lockdown from Thursday. Does the data show that it's necessary?

We know that deaths are rising and at present are on trend to overtake the April peak around the 3rd/4th week of November.

But ...1/n
... if cases are already in decline by now, then what will a 2nd lockdown do to help reduce deaths?

At best all it can do is accelerate an existing decline or at worse prevent cases from increasing again.

So are cases about to turn? Nationally, the picture is poised. /2
The 7 day centred moving average has turned but potential revisions to the last 7 days could reverse this (red triangles are a short CMA projection based on previous restatements).

The thing to note though is that the latest 7 day CMA is as of 26th October, 1 week ago.

... /3
Read 11 tweets
Nov 3, 2020
#USPresidentialElections2020 today so I thought I would list some facts and figures you might not be aware of.

This the 59th presidential election in USA and the 56th competitive one.

3 elections saw a candidate elected unopposed 1789, 1792, 1820.

1/n
Of the 55 competitive elections, 36 saw the winner win a majority of both the electoral college (EC) & popular vote (PV).

One, 1800, needed a contingent election in the House of Representatives as well, an oddity that led to the 12th Amendment that could play a part in 2020.

/2
14 of 55 competitive elections saw the winner take the majority of the electoral college with a plurality of the popular vote.

Lowest PV share to win an EC majority was 39.8% by Lincoln in 1860 (his name was not on the ballot in the South) followed by Nixon 68 & Clinton 92.

/3
Read 12 tweets

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