How well counts fit: chi-square
Compare category counts wey you observe with positive expected counts.
Your numbers
Di chi-square statistic
Use consistent units. Result follow the assumptions wey you enter.
Compare scenarios
You fit keep up to three snapshots for this tab. Loading one go replace the present inputs.
Formula
Use χ² = Σ(Oᵢ−Eᵢ)²/Eᵢ and df = k−1−p. Oᵢ and Eᵢ na observed and expected counts, k na category count, and p na parameters wey you estimate from di same data. Di p-value na di upper chi-square tail.
Compare category counts wey you observe with positive expected counts.
Example wey show the calculation
- Counts wey you observe
- 10, 20, 30
- Counts wey you expect
- 20, 20, 20
- Parameters wey you estimate from di same data
- 0
- Di chi-square statistic
- 10
- Di degrees of freedom
- 2
- p-value
- 0.00673794699909
Where e fit work and limits
Use consistent units. Result follow the assumptions wey you enter.
We check inputs for missing values and allowed ranges. Result wey pass the finite numeric range no go show. Rounding affect wetin display, while calculation use the model numeric precision.
Check your units and assumptions before you rely on result. Changing label no convert currency or physical unit.
Version of di formula: b6c7ff36547c · Example don get check: