chi-squared
Goodness of fit
Chi-squared is a statistical measure used to test whether observed data differs significantly from what would be expected by chance.
The chi-squared test compares actual frequencies against theoretical ones: A chi-squared test showed the results were statistically significant.
Written χ² in mathematical notation.
Central to hypothesis testing across sciences.
Uncertain possible event
- categoricalUnconditional and explicit
- independenceFreedom from external control
- homogeneityState of sameness throughout
- cross-tabulationTwo-variable frequency matrix
Pearson · p-value · residuals · association · nominal · ordinal
Departure from accepted standards
- multinomialExpression with several terms
- nonparametricStatistics assuming no distribution
- geneticsScience of hereditary transmission
- epidemiologyStudy of disease spread
Quantified chance of occurrence
- cumulativeIncreasing by successive additions
- quantileDistribution division point
- percentileStatistical ranking threshold
- centralIn the middle, primary
contingency
Uncertain possible event
- categoricalUnconditional and explicit
- independenceFreedom from external control
- homogeneityState of sameness throughout
cross-tabulation · Pearson · p-value · residuals · association · nominal · ordinal
deviance
Departure from accepted standards
- multinomialExpression with several terms
- nonparametricStatistics assuming no distribution
- geneticsScience of hereditary transmission
probability
Quantified chance of occurrence
- cumulativeIncreasing by successive additions
- quantileDistribution division point
- percentileStatistical ranking threshold
central · asymptotic · variance · skewness
- Probability Distributionsnormal distribution, PDF, normal curve, t-distribution, frequency distribution
- Calibrationcalibration, recalibration, zeroing, accuracy check, color calibration
chi-squaredt-test
Hypothesis check for averages
ANOVA · correlation coefficient · linear regression · F-test