State Poll Updates:
FL - Kerry 47-41
OH - Kerry 48-45
NJ - Kerry 49-40
National Poll Updates:
CNN - Bush 50-47 (notice they are in my outliar group)
Base case assumption: 60% of undecided/other votes to Kerry.
Created by TRUTHISALL
National Polling data: Pollingreport.com
State Polling data: Electoral-vote.com
PROLOGUE: THE LAST THREE PRESIDENTIAL ELECTIONS
(in millions of votes)
Dem 138.78 52.6%
Rep 125.03 47.4%
CURRENT POLL AVERAGES AND PROJECTIONS (%)
Average of 15 national polls.
State polls weighted by hist. vote sum to national pct.
______ Curr. Curr. Curr. Proj. Proj. Proj. Elec.
______ Nat. State Comb. Nat. State Comb. Votes
Kerry 48.6 46.2 47.4 52.6 52.0 52.3 332
Bush 44.7 44.2 44.4 47.4 48.0 47.7 206
Diff 3.9 2.0 3.0 5.3 3.9 4.6 126
Other 6.7 9.6 8.1
KERRY WIN PROBABILITIES (%)
Curr Prob: assume proportional allocation of und/other.
Proj. State: EV wins in 1000 simulation trials.
______ Curr. Curr Curr. Proj. Proj. Proj.
______ Nat. State Comb. Nat. State Comb.
Prob 89.2 98.8 94.0 93.9 99.8 96.8
NATIONAL VOTE/ WIN PROBABILITY SENSITIVITY ANALYSIS
Impact of various und/other allocation assumptions
Kerry
Alloc. 50% 55% 60% 65% 70%
Vote% 52.0 52.3 52.6 53.0 53.3
Prob% 87.5 91.1 93.9 95.9 97.4
ELECTORAL VOTE / WIN PROBABILITY SENSITIVITY ANALYSIS
One thousand election trials in each simulation.
Simulation I: Conservative Case
Assume: 50% of undecided/other to Kerry.
Kerry 51.0% of the vote.
Wins 98.8% of 1000 election trials.
Avg 317 electoral votes.
Max 380 electoral votes.
Simulation II: Most Likely Case
Assume: 60% of undecided/other to Kerry.
Kerry 52.0% of the vote.
Wins 99.8% of 1000 election trials.
Avg 332 electoral votes.
Max 383 electoral votes.
Simulation III: Optimistic Case
Assume: 70% of undecided/other to Kerry.
Kerry 52.9% of the vote.
Wins 100.0% of 1000 election trials.
Avg 347 electoral votes.
Max 390 electoral votes.
BUSH JOB APPROVAL IS APPROACHING AN ALL-TIME LOW
Data source: PollingReport.com
2004 Avg Nwk Fox CNN Pew Harris CBS ABC Time NBC AP Zogby Qpac
Jan 54.50 50 58 60 56 na 50 58 54 54 56 49 53
Feb 49.67 48 48 51 48 51 50 50 54 na 47 na 48
Mar 48.75 48 48 49 46 na 51 50 na 50 48 na 49
Apr 48.55 49 50 52 48 48 46 51 49 na 48 47 46
May 45.18 42 48 47 44 na 41 47 46 47 48 42 45
June 47.00 na 48 49 48 50 42 47 na 45 48 46 na
July 47.82 48 47 47 46 na 45 50 50 48 50 49 46
Aug 46.25 45 44 51 46 na 44 47 na na 49 44 na
11 NATIONAL POLLS: MONTHLY TREND / PROJECTION
Data source: PollingReport.com
Polls included in the average:
IBD, ABC, NWK, ARG, CBS, PEW, LAT, ZOGBY, TIME,DEMCORP,
QPAC
NBC, CNN, AP and FOX are EXCLUDED from this
group.
They are INCLUDED in the 15-Poll group.
Kerry is at an all-time HIGH 49.7%
Bush is at an all-time LOW 44.0%
Kerry's projection is equal to his average poll
plus 60% of undecided/other voters.
Avg Polling Trend Projection
2004 Kerry Bush Diff Kerry Bush Diff
Jan 44.8 48.7 -3.8 45.5 54.5 -9.0
Feb 48.7 45.3 3.3 52.3 47.7 4.5
Mar 48.1 44.6 3.6 52.5 47.5 5.0
Apr 47.1 45.1 2.0 51.8 48.2 3.6
May 47.6 44.4 3.2 52.4 47.6 4.8
June 47.4 45.1 2.3 51.9 48.1 3.8
July 48.1 45.0 3.1 52.2 47.8 4.5
Aug 49.7 44.0 5.7 53.5 46.5 6.9
15 NATIONALPOLLS: CURRENT AVERAGE/ FORECAST SCENARIOS
48.60% Average (mean) of 15 national polls
4.04% Plus: 60% of undecided/other voters
52.64% Equals: Projected Kerry vote
93.90% is Kerry's probability of a popular vote
majority
______ Poll Curr. Curr. Kerry/ Undecided/other alloc.
______ Date Kerry Bush Bush 50.0 55.0 60.0 65.0 70.0
TIME 807 51 43 54.3 54.0 54.3 54.6 54.9 55.2
FOX 804 46 43 51.7 51.5 52.1 52.6 53.2 53.7
CNN/GAL 810 47 50 48.5 48.5 48.7 48.8 49.0 49.1
LAT 721 48 46 51.1 51.0 51.3 51.6 51.9 52.2
PEW 810 47 45 51.1 51.0 51.4 51.8 52.2 52.6
IBD 806 49 43 53.3 53.0 53.4 53.8 54.2 54.6
CBS 730 49 43 53.3 53.0 53.4 53.8 54.2 54.6
DEMC 805 52 45 53.6 53.5 53.7 53.8 54.0 54.1
ABC/WP 802 52 45 53.6 53.5 53.7 53.8 54.0 54.1
NWK 730 52 44 54.2 54.0 54.2 54.4 54.6 54.8
ZOGBY 729 48 43 52.7 52.5 53.0 53.4 53.9 54.3
AP 806 48 45 51.6 51.5 51.9 52.2 52.6 52.9
NBC/WSJ 721 45 47 48.9 49.0 49.4 49.8 50.2 50.6
801 49 45 52.1 52.0 52.3 52.6 52.9 53.2
QPAC 722 46 43 51.7 51.5 52.1 52.6 53.2 53.7
Mean ______ 48.6 44.7 52.1 52.0 52.3 52.64 53.0 53.3
ProbWin ______ ______ ______ 89.2 87.5 91.1 93.90 95.9 97.4
MoE 3.35
Std 1.71
95% Confidence Interval
Max ______ 51.9 48.0 55.5 55.3 55.7 56.0 56.3 56.7
Min ______ 45.3 41.3 48.8 48.6 49.0 49.3 49.6 50.0
x ______ 48.0 48.0 50.0 50.0 50.0 50.0 50.0 50.0
Prob>x ______ 63.4 2.5 89.2 87.5 91.1 93.90 95.9 97.4
99% Confidence Interval
Max ______ 53.0 49.1 56.5
Min ______ 44.2 40.3 47.7
x ______ 49.1 49.1 50.0
Prob>x ______ 39.1 0.5 89.2
95% Confidence Limits:
Max = Mean + 1.96 * Std
Min = Mean - 1.96 * Std
99% Confidence Limits:
Max = Mean + 2.58 * Std
Min = Mean - 2.58 * Std
National Poll Average Mean
MoE 3.10%
Std 1.58%
Group 15-polls 11-polls
Kerry 48.60% 49.67%
Bush 44.67% 44.00%
2-party vote:
Kerry 52.11% 53.02%
EFFECT OF POLLING SAMPLE SIZE, MOE AND STD
ON THE ACCURACY OF THE SAMPLE MEAN
National polls sample about 1000 out of 150 million potential
voters.
The MoE for a 1000 sample is approx. 3.1%.
For 15 polls (equivalent to 15000 samples) the MOE is
0.80%.
The MoE decreases as the poll sample size (N)
increases.
MoE = 1.96 / (2*sqrt(n)) = 1.96* Std
where the Standard Deviation Std = 1 / (2*sqrt(n))
The Win Probability Matrix displays probabilties for
various poll samples.
The 11 and 15-poll group averages are used once again
to determine the probability of a Kerry majority
vote,
but now we assume 11,000 and 15,000 samples.
The win probabilities are much higher (a fraction below
100%)
than probabilitiies computed from a typical 1000
sample.
It makes sense intuitively that if more samples are
taken
from a population, the more accurate the sample mean.
KERRY WIN PROBABILITY MATRIX
(based on sample size and percent mean)
Sample Sample Std Kerry Percent of 2-party Vote
Size MoE Dev 50.5% 51.0% 52.0% 52.11% 53.02% 54.0% 55.0%
600 4.00% 2.04% 59.7 68.8 83.6 84.9 93.1 97.5 99.3
1000 3.10% 1.58% 62.4 73.6 89.7 90.88 97.21 99.4 99.9
1500 2.53% 1.29% 65.1 78.1 93.9 94.9 99.0 99.9 100.0
2000 2.19% 1.12% 67.3 81.4 96.3 97.0 99.7 100.0 100.0
3000 1.79% 0.91% 70.8 86.3 98.6 99.0 100.0
4000 1.55% 0.79% 73.6 89.7 99.4 99.6
5000 1.39% 0.71% 76.0 92.1 99.8 99.9
6000 1.27% 0.65% 78.1 93.9 99.9 99.9
7000 1.17% 0.60% 79.9 95.3 100.0
8000 1.10% 0.56% 81.4 96.3
9000 1.03% 0.53% 82.9 97.1
10000 0.98% 0.50% 84.1 97.7
11000 0.93% 0.48% 85.3 98.2
12000 0.89% 0.46% 86.3 98.6
13000 0.86% 0.44% 87.3 98.9
14000 0.83% 0.42% 88.2 99.1
15000 0.80% 0.41% 89.0 99.3
ELECTORAL VOTE SIMULATION FORECAST METHODOLOGY
Kerry National and State Vote Projections
State vote%: Latest state poll plus undecided/other
voters.
National vote%: Weighted sum of projected % state
votes.
Probability of a state win is based on projected %
vote.
Most Likely Case:
60% of undecided/other voters to Kerry.
Win Prob. Pct EV
Kerry 99.80% 51.97% 332
Bush 0.20% 48.03% 206
Historical Vote %, Kerry Projection and Win Probability
Hist. Dem share vs Repub in last three presidential
elections.
______ Dem Kerry Kerry EV (election trials 1-10 of 1000)
______ Hist. Proj. Prob. 1 2 3 4 5 6 7 8 9 10
State 52.6% 51.97% 99.8% 317 328 319 332 304 355 345 343 327 332
AL 44.8 40.0 0.0
AK 37.6 39.6 0.0
AZ 48.8 49.2 34.8 10 10 10
AR 55.2 49.6 42.2 6 6 6 6 6
CA 57.4 56.4 99.9 55 55 55 55 55 55 55 55 55 55
CO 48.8 48.4 21.7 9 9
CT 57.7 60.8 100.0 7 7 7 7 7 7 7 7 7 7
DE 56.8 56.8 100.0 3 3 3 3 3 3 3 3 3 3
DC 90.3 89.0 100.0 3 3 3 3 3 3 3 3 3 3
FL 50.7 54.2 98.0 27 27 27 27 27 27 27 27 27 27
GA 47.6 45.2 0.9
HI 59.0 54.6 98.8 4 4 4 4 4 4 4 4 4 4
ID 35.7 37.0 0.0
IL 57.9 58.2 100.0 21 21 21 21 21 21 21 21 21 21
IN 44.8 43.2 0.0
IA 51.8 51.6 78.3 7 7 7 7 7 7 7 7 7
KS 42.4 40.8 0.0
KY 46.7 45.6 1.6 8
LA 49.2 43.2 0.0
ME 57.1 52.8 91.5 4 4 4 4 4 4 4 4 4
MD 57.8 57.8 100.0 10 10 10 10 10 10 10 10 10 10
MA 65.3 64.4 100.0 12 12 12 12 12 12 12 12 12 12
MI 54.7 54.4 98.4 17 17 17 17 17 17 17 17 17 17
MN 55.7 51.8 81.1 10 10 10 10 10 10 10 10 10
MS 44.3 35.4 0.0
MO 52.5 50.8 65.2 11 11 11 11
MT 44.9 41.4 0.0
NE 37.5 36.0 0.0
NV 49.9 50.4 57.8 5 5 5 5 5 5 5 5 5
NH 51.7 54.4 98.4 4 4 4 4 4 4 4 4 4 4
NJ 56.5 55.6 99.7 15 15 15 15 15 15 15 15 15 15
NM 53.0 54.2 98.0 5 5 5 5 5 5 5 5 5 5
NY 62.6 63.0 100.0 31 31 31 31 31 31 31 31 31 31
NC 46.6 47.0 7.1 15
ND 40.8 36.6 0.0
OH 50.8 52.2 85.9 20 20 20 20 20 20 20
OK 42.8 40.8 0.0
OR 53.6 52.4 88.0 7 7 7 7 7 7 7 7 7
PA 54.2 54.6 98.8 21 21 21 21 21 21 21 21 21 21
RI 65.6 64.6 100.0 4 4 4 4 4 4 4 4 4 4
SC 44.4 47.0 7.1
SD 44.5 43.4 0.1
TN 50.5 49.6 42.2 11 11 11
TX 44.3 41.8 0.0
UT 33.6 28.6 0.0
VT 59.4 58.8 100.0 3 3 3 3 3 3 3 3 3 3
VA 47.3 49.2 34.8 13 13 13 13
WA 55.9 54.6 98.8 11 11 11 11 11 11 11 11 11 11
WV 54.0 52.8 91.5 5 5 5 5 5 5 5
WI 52.7 51.2 72.2 10 10 10 10 10 10 10
WY 38.3 30.4 0.0
Avg 52.6% 51.97% 99.8% 317 328 319 332 304 355 345 343 327 332