How this calculation works
Convert a chi-square statistic to a right-tail area using its degrees of freedom.
THE FORMULA
P(X≥x)=Q(df/2,x/2)A worked example
For two degrees of freedom, the survival probability is exp(−x/2), giving one half at 2 ln 2.
Good to know
Supply the statistic from the method you are using.
Reference: OpenStax Introductory Statistics (opens in a new tab) ↗
Read the result
Convert a chi-square statistic to a right-tail area using its degrees of freedom.
The primary result is labeled “Upper-tail probability”. Keep the input definitions in view when comparing this result with another method.
Try a related calculation
Supply the statistic from the method you are using.
For a related exercise, try the statistics calculator.
A few questions, answered
How can I check the default inputs by hand?
For two degrees of freedom, the survival probability is exp(−x/2), giving one half at 2 ln 2.
Which rule does this calculator apply?
P(X≥x)=Q(df/2,x/2)