Reading polls as a trader means looking past single headline numbers to understand margins of error, trends and methodology before updating a political market estimate.
Margin of Error
A lead within the margin of error is not a clear lead. Small shifts between polls are often noise.
Averages Over Single Polls
Averages across several polls usually tell you more than one surprising result. Watch the trend, not the outlier.
Methodology
Sample size, who was surveyed and timing affect results. Different pollsters can disagree for good reasons.
Worked Example
One poll shows a candidate up 5 points and the market jumps from 50¢ to 58¢. The polling average moved only 1 point. A trader judges the jump to be larger than the evidence supports and keeps their estimate near 52%.
Key Takeaways
- Respect the margin of error.
- Prefer averages to single polls.
- Check methodology and timing.
- Markets can overreact to one poll.