Proportional Representation powerpoint presentations for explaining and calculating seat allocations using various PR and election systems: St Lague (Sainte-Laguë), Modified St Lague (Modified Sainte Laguë), D'hondt (dhondt), STV, MMP (AMS), AV (Alternative Vote), Two-Tier PR and Two round majoritarian electoral systems, and and the first past the post (FPTP) method - free to use for non-commercial use.

This website gives you free Powerpoint demonstrations that explain how to calculate the seats that are allocated through the most common methods of Proportional Representation and other seat allocation methods. It also allows you to download an Excel speadsheet that calculates the seats allocation through the St Lague, Modified St Lague and d'Hondt methods of PR and other seat allocation methods. The files are free for personal study and for public presentations where no money is involved but costs a small amount otherwise - see the full copyright notice below.

The files are designed for presenting in workshops, public sessions and courses. The files currently expect some level of prior knowledge about electoral systems.

Dr Peter Clayton is available as a presenter and facilitator for presenting these files and explaining the different electoral systems. Click here to email him.

www.proportionalrepresentation.co.uk

Copyright notice: All the files are copyright 2009 of Peter Clayton, all rights reserved. They are free to use for all presentations where the participants have not paid to attend the presentations and also where the organisation is a not-for-profit organisation. For everyone else there is a small fee to purchase a licence to use each file. Academic institutions that charge their students a fee to attend their institution must also pay the small licence fee.

Click here to purchase a licence to use one, more or all of the presentations.

Powerpoint demonstrations of Proportional Representation and other seat allocation methods

You must read the How To Guide at the bottom of this page or the presentations will be unreadable because they are dynamic and may not appear properly otherwise!

The following files are available for downloading and using:

NEW: Alternative Vote (AV) voting system as proposed for use in the UK referendum on 5 May 2011

Link to Yes campaign for AV                       Link to No campaign for AV (PS try to spot the false logic in many of their arguments)

First Past The Post Voting System - FPTP (Single Member Plurality)

Mixed Member Proportional (MMP) seat allocation explanation and demonstration (mixture of Proportional Representation and First Past the Post) - a hybrid system called Additional Member System (AMS) in the UK. A form of MMP is to use AV (see below) to assign the constituency seats and then called AV+ in the UK.

St Lague (Sainte-Laguë) Proportional Representation seat allocation explanation and demonstration

Modified St Lague (Modified Sainte Laguë)Proportional Representation seat allocation explanation and demonstration

d'Hondt Proportional Representation seat allocation explanation and demonstration

Droop Quota Proportional Representation seat allocation explanation and demonstration

Hare Quota and Largest Remainder Proportional Representation seat allocation explanation and demonstration

Single Transferable Vote (STV) seat allocation explanation and demonstration - Alternative Vote (AV) is the same as this but used for single seat constituencies - can also be used as a form of MMP to be called AV+ in the UK.

Two Tier Proportional Representation seat allocation explanation and demonstration

Two Round Majoritarian seat allocation explanation and demonstration

Please contact Peter Clayton to ask for modifications in layout or content, or to personalise the files with your own logo and headings.

Click here to purchase a licence to use one, more or all of the presentations.

Excel Seat Allocation Software for calculation Proportional Representation

PR seat allocation Excel software using St Lague, Modified St Lague and d'Hondt methods (Warning: large 8Mb file)

Press the "Read Only" button when you open the file.

The Excel file works in Excel 2003 and Excel 2007 and works for upto 50 parties and upto 500 seats.

Please contact Peter Clayton for modifications in layout or increasing the number of parties or seats, or to personalise the file with your own logo and headings.

Copyright notice: All the files are copyright 2009 of Peter Clayton, all rights reserved. They are free to use for all presentations where the participants have not paid to attend the presentations and also where the organisation is a not-for-profit organisation. For everyone else there is a small fee to purchase a licence to use each file. Academic institutions that charge their students a fee to attend their institution must also pay the small licence fee.

Click here to purchase a licence to use one, more or all of the presentations.

Ballot Symbol Lottery Software

Excel Spreadsheet that allows you to select a symbol for each party from a list of available symbols.without duplication

Press the "Read Only" button when you open the file.

Modify the party names and then select a Symbol ID for each of them in turn from the drop-down list. You cannot select the same symbol twice.

The Excel file works in Excel 2003 and Excel 2007 and works for upto 12 parties and upto 12 symbols.

Please contact Peter Clayton for modifications in layout or increasing the number of parties or symbols, or to personalise the file with your own logo and headings. This will incur a charge.

Copyright notice: All the files are copyright 2009 of Peter Clayton, all rights reserved. They are free to use for all presentations where the participants have not paid to attend the presentations and also where the organisation is a not-for-profit organisation. For everyone else there is a small fee to purchase a licence to use each file. Academic institutions that charge their students a fee to attend their institution must also pay the small licence fee.

How to download and view the demonstration files

Right click on the files you want from the following list and select the "Save Target As..." or the "Save File As..." menu option.

Select the folder on your computer that you want to save it to and press the Save/OK button.

Go to that folder and open up the file. (Note that if you don't have Microsoft Powerpoint installed then you can install the free Powerpoint Viewer software from here.)

It will ask you for a password but press the "Read Only" button instead to view the file. The presentations are protected by a password to change them but you are not prevented from viewing them.

Press F5 to work your way through the presentation by pressing the Enter/Space button or by clicking your mouse at the appropriate time. Please allow a short time after each click/press to allow the dynamic movements to start.

Important Note: You need to RUN the powerpoint presentation to be able to view the explanation (ie Press F5). If you just open it without running the presentation then you will not be able to read it - this is because it is a dynamic presentation.

Copyright notice: All the files are copyright 2009 of Peter Clayton, all rights reserved. They are free to use for all presentations where the participants have not paid to attend the presentations and also where the organisation is a not-for-profit organisation. For everyone else there is a small fee to purchase a licence to use each file. Academic institutions that charge their students a fee to attend their institution must also pay the small licence fee.

Click here to purchase a licence to use one, more or all of the presentations.

Comparison of electoral systems for UK General Election 2010 (649 FPTP seats declared)

uk general election pr proportional representation comparison fptp
If you want to share this graph with people then please send them a link to this website. You do not need a licence to create a link to this website but you do need to get a licence to copy and re-use the numbers and graphs from this website in any publications or on external websites. Not-for-profit organisations will not be charged for a licence but should still request a free licence.
Please contact Peter Clayton for a licence. Un-licenced use will cost £1000 per use.

This site is also found at the following locations:

election software.co.uk
election calculator.com
election calculator.co.uk
seat allocation.com
seat allocation.co.uk
proportional representation.co.uk
st lague.com
st lague.co.uk
modified st lague.com
modified st lague.co.uk
d'hondt.co.uk
dhondt.co.uk
election administration.co.uk
election administrator.com
election administrator.co.uk
electioncommission.co.uk
electioncommission.org.uk

Other userful websites:

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Election results administration and seat allocation calculation software using Modified St Lague, D'hondt (dhondt), MMP, proportional representation and first past the post (FPTP) methods