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Encouraging News for GOP: How to Adjust Polls for Democrat Oversampling Bias
October 28, 2008 | Self

Posted on 10/28/2008 9:50:19 AM PDT by Zakeet

The validity of all of the MSM / Liberal University poll results depends on the critical assumptions that: (1) Democratic voters are so enthused over Barry they will turn out in record numbers and (2) Republican voters are so disgusted with Bush/McCain they will refuse to vote in record numbers.

Unfortunately for the pollsters, that premise does not appear to be correct in the case of our second largest state, Texas. As noted HERE, actual data from the Texas Secretary of State indicates both registrations and early voting numbers are higher in Republican strongholds than Democratic areas. This is the opposite of what we should see if the pollsters' underlying assumptions were correct.

It remains to be seen if this pattern holds for other states; perhaps other Freepers might care to search for objective data from other areas, and perform a similar analysis.

This brings up the next question: how can one adjust for Democrat oversampling bias?

Actually, it's not difficult using Zak's Rule of Thumb. Here's how it works:

Assume:

  1. Democratic voters are oversampled by two percentage points;

  2. The biased sampling will be split more or less equally between Republicans and Independents [or in other words, the actual turnout will be about 1/3 Democrat, 1/3 Republican and 1/3 Independent];

  3. Democratic and Republican voters will favor their party's candidate by roughly 90/10 margin; and

  4. Independents will more or less break evenly between the two major parties

In this case:

  1. Two percentage points will be deducted from the Democratic vote;

  2. One of the two percentage points will go to the Republicans – and it will result in a 0.9 percent increase for the GOP and a 0.1 percent increase for the Democrats;

  3. One of the two percentage points will go to the Independents – and it will result in a 0.5 percent increase for both the Republicans and Democrats.

Which results in the following bottom line for a two percent Democratic over-sample:

By extension, this results in the following:

Adjustments for Oversampling Bias

Bias Amt Add to Rep Sub from Dem
1% 0.7% 0.7%
2% 1.4% 1.4%
3% 2.1% 2.1%
4% 2.8% 2.8%
5% 3.5% 3.5%
6% 4.2% 4.2%
7% 4.9% 4.9%
8% 5.6% 5.6%
9% 6.3% 6.3%
10% 7.0% 7.0%
11% 7.7% 7.7%
12% 8.4% 8.4%
13% 9.1% 9.1%
14% 9.8% 9.8%
15% 10.5% 10.5%


Finally, I suggest you check out the MSM / Liberal University Polls, apply the fudge factor, and see how many have McCain/Palin either ahead or within the margin of error.

Despite what the MSM may report, this election doesn't appear to be lost – by a long shot!


TOPICS: News/Current Events; Politics/Elections
KEYWORDS: mediabias; msm; polls; polls08
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Sorry if someone has already posted a similar algorithm for adjusting for MSM bias. I searched but couldn't find anything.

I'm not sorry for shamelessly naming the algorithm after myself.

1 posted on 10/28/2008 9:50:19 AM PDT by Zakeet
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To: Zakeet

Great post!

When I look at polls this gives me a chance to really evaluate them.


2 posted on 10/28/2008 9:53:42 AM PDT by Moconservative
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To: Zakeet
Bump for the Zakeet Algorithm. Now to test it on election day.
3 posted on 10/28/2008 9:53:56 AM PDT by mnehring (We Are Joe!)
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To: Zakeet
I think you're right. Party turnout will be even this year, if early voting indications hold true on Election Day. The model of an Obama victory rests on the assumption the Dems are going to turn in numbers never seen before. And well if those numbers aren't going to be there, that model is in trouble.

"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus

4 posted on 10/28/2008 9:54:28 AM PDT by goldstategop (In Memory Of A Dearly Beloved Friend Who Lives In My Heart Forever)
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To: Zakeet

And how about the so-called Bradley/Wilder effect?


5 posted on 10/28/2008 9:57:21 AM PDT by mc5cents (Show me just what Mohammd brought that was new, and there you will find things only evil and inhuman)
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To: goldstategop

Unless Republicans have seriously embraced early voting (which is a possibility), the closeness of much of the early voting could indicate that we will turn out in larger numbers than the Dems.

With what’s at stake here, it wouldn’t surprise me.


6 posted on 10/28/2008 10:01:20 AM PDT by perfect_rovian_storm (You MUST see this website: http://www.neverfindout.org/)
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To: Zakeet
I agree.

Reagan and Mondale were more comparable than the two sets of candidates in this race. Mondale took only his home state of WI. Obama might not even win IL. He will probably win DC for 3 EV.

Here's also another hope and prayer that the downstream House and Senate races are also major turn-abouts.

Hey, maybe this explains why the media's leftist screamin'-demons are lying their butts off, and thrashing about like vampires with holy water in their eyes.

7 posted on 10/28/2008 10:02:59 AM PDT by meadsjn (Socialists promote neighbors selling out their neighbors; Free Traitors promote just the opposite.)
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To: Zakeet

You forgot a key demographic!

The “Voting McCain, but too lukewarm to talk with pollsters” group which equals about 5%!!!!


8 posted on 10/28/2008 10:02:59 AM PDT by G Larry (BarackÂ’s character has been molded by extremists)
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To: Zakeet

“Democratic voters are oversampled by two percentage points;”??????????????????????????

Here’s my take on a couple of recent polls [part taken from another poster yesterday]:

SurveyUSA Virginia: O-52%, M-42%
http://www.surveyusa.com/clien...15-9928-119c5590638e

But, look at the fine print:

They surveyed: R-30%, D-38%, I-30%

2004 Exit Polls showed: R-39%, D-35%, I-26% for virginia.

Are there 8.5% more Democrats in Virginia than in 2004?

Are there 23% fewer republicans in Virginia compared to 2004?????????????

Another bogus Poll:

North Carolina OBama 49 McCain 48
http://www.publicpolicypolling...lease_NC_1027484.pdf

BUT who did they poll???

Democrat: 48
Republican: 35
Independent /other:17


9 posted on 10/28/2008 10:04:00 AM PDT by Bulwinkle ( John & Sarah - For America)
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To: Zakeet

Zakeet Zings Zogby!

(film at 11)


10 posted on 10/28/2008 10:07:28 AM PDT by kidd
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To: goldstategop

“The model of an Obama victory rests on the assumption the Dems are going to turn in numbers never seen before. And well if those numbers aren’t going to be there, that model is in trouble.”

I think his turn out in very Blue States will be unprecedented, NY, CA, MA, IL, NJ, etc.., but Repub turn out in contested and uncontested Red States will equal The One’s. I think it’s possible Bambi could win the general but lose the electoral. Oh yeah, McCain will take NH.


11 posted on 10/28/2008 10:16:18 AM PDT by moose2004 (Drill, Drill, Drill, Drill, Drill, Drill And Then Drill Some M,ore)
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To: mc5cents; G Larry
And how about the so-called Bradley/Wilder effect?

You forgot a key demographic! ... The “Voting McCain, but too lukewarm to talk with pollsters” group which equals about 5%!!!!

Both are simple adjustments.

Pick your own number for both effects. For example, assume 4 percent for the Bradley effect and 5 percent for other polling bias (e.g. won't talk, tells pollster what they think the pollster wants to hear, etc.) Finally assume a Democratic over-sample of, say, 5 percent.

Finally, add the numbers up (in this case, a total Democratic bias of 14 percent), look up the magic number (in this case, 9.8 percent), and then adjust the Rat vote down by that amount (9.8 percent) and the Pubbie vote up by that amount.

In your example, you get a 19.6 percent swing!

As you can see, it doesn't take much bias to totally trash an MSM / Liberal University poll.

12 posted on 10/28/2008 10:17:52 AM PDT by Zakeet (Crime wouldn't pay if the government ran it)
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To: goldstategop

They also do not account for the millions of mad Dem women and men at Obama stealing the nomination from Hillary with ACORN voter fraud along with Dean/Reid/Pelosi. They are mad and have been out helping McCain in key battleground states. A lot of the sourced negative info on Obama has come out of the PUMA’s.


13 posted on 10/28/2008 10:19:24 AM PDT by PhiKapMom ( BOOMER SOONER -- VOTE FOR McCAIN/PALIN2008! LetsGetThisRight.com)
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To: G Larry

There are a couple of things that have caught my attention. One is the absence of McCain bumper stickers, yard signs, etc. Part of that is probably explained by the “lukewarm” thing mention, but part of it is just as likely people not wanting to have their property vandalized by supporters of “The One”. As close as these polls always seem to be, I think you’d expect to see more open displays of support for McCain. Aother thing I notice is that here in my very liberal gentrified Nashville neighborhood I don’t see near as many Obama signs as I remember seeing for the candidates of other presidential years. All in all, I think support for McCain has been somewhat intimidated into silence and support for Obama overhyped and inflated.


14 posted on 10/28/2008 10:21:37 AM PDT by Emmett McCarthy
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To: Zakeet

I understood “of,” “and,” and “the.”


15 posted on 10/28/2008 10:34:11 AM PDT by pabianice (Inexplicable and infuriating.)
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To: Bulwinkle; Zakeet
"BUT who did they poll???"

Probably the best question.

Makes a HUGE difference who they ask, and the questions.

I have thought for many years that the media must get their poling list from their subscriber list.

Nobody has ever called me for my opinion.

I remember way back when, before we decided our leaders by popular opinion polls, that we used to vote to actually elect them.

(funny, huh?)

Nowadays it seems as if anybody with a list of people can produce a poll, and help steer public opinion along with the big boys in the media.

16 posted on 10/28/2008 10:34:22 AM PDT by Designer (We are SO scrood!)
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To: meadsjn
Mondale took only his home state of WI.

Mondale is from Minnesota, not Wisconsin.

But, you are correct: he won the EV only from his home state (MN) and DC. However, I remember an interesting fact: Mondale won MN by a very small amount... a few thousand votes.

To put it in perspective, had one more person voted in the election for Reagan in each precinct (or one person voting for Mondale had stayed home), Reagan would have won MN.

If only one person in half of the precincts flipped their vote from Mondale to Reagan, Reagan would have won MN.

17 posted on 10/28/2008 10:37:52 AM PDT by justlurking (The only remedy for a bad guy with a gun is a good guy with a gun.)
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To: Emmett McCarthy

I see a similar thing here is Taxacussets. I live in Middlesex county north west of Boston and the signs in my town and surrounding towns is 3 to 1 in McCains favor. Its very strange.

When I speak to folks I get more M supporter than O supporters. The real kicker is I work a second job at night and the parking lot is about 50-50 bumper stickers, whats strange is they are mostly teamster but supporting M. Not saying M will take MASS(No way) but it just really strange. The support is not adding up for the annointed one.


18 posted on 10/28/2008 10:57:21 AM PDT by biggiant1 (MA Republican - the looniest man in Massachusetts - conservative and a Giants fan)
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To: justlurking
Mondale is from Minnesota, not Wisconsin.

You're right. Hope I didn't offend any of the ice fishing contingent.

19 posted on 10/28/2008 11:52:13 AM PDT by meadsjn (Socialists promote neighbors selling out their neighbors; Free Traitors promote just the opposite.)
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To: meadsjn
Hope I didn't offend any of the ice fishing contingent.

In all honesty, I think a lot of people in MN wish Mondale was from WI.

However, I doubt many in WI would want him.

20 posted on 10/28/2008 12:00:02 PM PDT by justlurking (The only remedy for a bad guy with a gun is a good guy with a gun.)
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