κ
Research & Statistics
Reliability, agreement, sample size.
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Cohen's Kappa Calculator (Inter-Rater Agreement)
How well do two coders agree beyond chance?
(p_o − p_e)/(1 − p_e)
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Krippendorff's Alpha Calculator
How reliable is coding by two or more coders, allowing missing data?
1 − (n−1)ΣoΔ / ΣnnΔ
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Cronbach's Alpha Calculator (Scale Reliability)
How internally consistent is my questionnaire scale?
k/(k−1)(1 − Σσ²ᵢ/σ²ₜ)
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Sample Size Calculator (Surveys)
How many respondents do I need for a given margin of error and confidence level?
z²p(1−p)/e², FPC
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Margin of Error Calculator
What is the margin of error of my survey result?
z·√(p(1−p)/n)