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UNH House Polls and a Few More Grains of Salt

by: Laura Clawson

Wed Jul 23, 2008 at 13:13:44 PM EDT


Let's start our consideration of the UNH poll results with their partisan breakdowns, since that's been the place their sample is clearly inconsistent. July registrations, statewide, broke down as 30.5% Democratic, 31.1% Republican, and 38.3% undeclared. The 5.5% of the UNH first district sample and 7% of the second that's unregistered makes it difficult to assess compare directly, but in any case, what I'm most interested in is the sample from poll to poll.

Here's how that goes:

DemRepInd
July Poll 1st District25.527.241.3
April - 1st District26.325.941.8
January - 1st District37.126.628.1

DemRepInd
July Poll 2nd District25.228.238.2
April - 2nd District27.521.542.9
January - 2nd District29.324.738.7

But the key point I've been trying to make is that the fluctuations in the sample of this poll from one to another make it problematic to directly compare them.

So from January to April, Carol Shea-Porter's net favorability dropped from +26 to +11 at the same time as Andy Smith's sample of Democrats dropped from 37% (which was way too high) to 26%. From April to July, Andy Smith's first district sample remained relatively stable, and Shea-Porter's favorability dropped further as her opponents worked hard to negatively define her, but her head-to-head match-ups with Jeb Bradley and John Stephen changed very little.

Meanwhile, in the second district, the sample had both Democrats and Republicans losing ground to undeclareds in April, and Republicans jumping considerably in July with both Democrats and undeclareds dropping. And lo and behold! Hodes dropped in his head to head match-ups with Bob Clegg and Jennifer Horn. Who ever would have thought that when you raise the Republicans in your sample by nearly 7 points, the Democratic incumbent's head-to-heads will suffer a bit?

So, with that said, take it for what it's worth: That is, somewhat more than ARG, but not a whole lot at least up until the pre-election tracking poll starts.

If you still want the numbers, here they are. I'm including April numbers in parentheses, even though the comparison is, as I've detailed, problematic:

First district MoE 6.4%
Shea-Porter 40 (39)
Bradley 46 (45)

Shea-Porter 42 (43)
Stephen 36 (35)

Second district MoE 6.3%
Hodes 44 (51)
Clegg 25 (24)

Hodes 43 (52)
Horn 23 (25)

(Edited to add MoE.)

Update: In case anyone's wondering, here are the statewide sample numbers.  

DemRepInd
January32.925.633.6
April26.923.742.4
July25.327.639.9

I should also note, some of these fluctuations aren't at all significant. I'm just laying them all out because some are and I think it's important to have as much information as possible available.

Laura Clawson :: UNH House Polls and a Few More Grains of Salt
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Poll mechanics question (0.00 / 0)
When a pollster reports that 121 respondents were "registered Democrats," is that based on what the respondents said? Or does the pollster start with a list of registered voters and their party IDs (and telephone numbers, natch)?

some do, some don't (4.00 / 2)
Based on the UNH Survey Center press release description of their methodology, it does not sound like they call from a list of registered voters; it says "[f]ive hundred (519) randomly selected New Hampshire adults were interviewed by telephone between July 11 and July 20, 2008."

I'm a Jeanne Shaheen friend and staffer.


[ Parent ]
Yep, that's my read also, (0.00 / 0)
especially since they end up with unregistered people in the sample.

[ Parent ]
DiStaso covers BH polling discussion (4.00 / 1)
Granite Status today: UNH polling techniques cause angst among Dems.

UNH's polling technique is being questioned on the liberal blog BlueHampshire.com, which began disparaging its methods on Tuesday, about seven hours before it was released. A writer there said UNH's polls have "serious sampling problems." Too many Republicans are being included, apparently, at least for BlueHampshire's liking.

Are we whining about the poll methodology more than when a poll favors the Democrats? Coupla points:

  1. Maybe so, at least some. I've seen Laura raise questions about the demographic breakdown and sample size of the UNH poll in particular regularly for over a year - this isn't a new issue. But, I can also find plenty of front-page posts on UNH polls that favor the Dems where concerns about methodology didn't get raised until the comments, if at all.
  2. But, outliers get more attention. The July UNH poll results stand alone: the other polls, including earlier UNH polls, show a MUCH greater Shaheen lead. When you ask "Why is this so different?" methodology has to be a prime suspect.
  3. It isn't 'too many Republicans.' It's "too few Democrats." And the metric isn't "our liking," it's the voter rolls. What we want from polls is a sample that accurately reflects the demographics who vote.

In DiStaso's article, Smith explains that the survey teams samples random voters and the lets the demographic breakdown fall where it may. There is a danger of skewing the results otherwise.

Okay, but the next step is informed analysis. If we compare the UNH Feb and July polls we find:

  1. 7.5% fewer Democrats
  2. 5% more in the age 50-64 group
  3. 3.8% more with family income $75K-$100K, and 5.5% more with family income above that. Lower income groups all shrank.

If we assume that incomes and ages have not changed dramatically here in the last five months, what else might explain that?


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