Is a 4-point lead in a poll actually a lead? Not always. Standard margins of error don’t account for the sampling error involved when comparing the difference between two candidates in the same poll. This advanced calculator determines if one candidate truly has a statistically significant lead over another at the 95% confidence level.
Ballot Lead Calculator
How to Use
- Candidate A & B %: Enter the top-line ballot percentages for the two candidates you are comparing.
- Sample Size: Enter the total number of respondents in that specific poll.
- Click “Calculate Limits” to see if the lead is real (statistically significant) or if the race is effectively tied.
Why It Matters for Research
Misinterpreting a statistical tie as a genuine lead can be a fatal error in a campaign. It can lead to complacency when urgency is needed, or panic when a steady course is required. This calculator provides mathematical certainty, allowing you to report on and react to poll numbers with confidence, knowing whether a lead is real or just a result of random sampling variation.