scipy.stats.obrientransform¶
- scipy.stats.obrientransform(*args)[source]¶
Computes the O’Brien transform on input data (any number of arrays).
Used to test for homogeneity of variance prior to running one-way stats. Each array in *args is one level of a factor. If f_oneway is run on the transformed data and found significant, the variances are unequal. From Maxwell and Delaney [R550], p.112.
Parameters: args : tuple of array_like
Any number of arrays.
Returns: obrientransform : ndarray
Transformed data for use in an ANOVA. The first dimension of the result corresponds to the sequence of transformed arrays. If the arrays given are all 1-D of the same length, the return value is a 2-D array; otherwise it is a 1-D array of type object, with each element being an ndarray.
References
[R550] (1, 2) S. E. Maxwell and H. D. Delaney, “Designing Experiments and Analyzing Data: A Model Comparison Perspective”, Wadsworth, 1990. Examples
We’ll test the following data sets for differences in their variance.
>>> x = [10, 11, 13, 9, 7, 12, 12, 9, 10] >>> y = [13, 21, 5, 10, 8, 14, 10, 12, 7, 15]
Apply the O’Brien transform to the data.
>>> from scipy.stats import obrientransform >>> tx, ty = obrientransform(x, y)
Use scipy.stats.f_oneway to apply a one-way ANOVA test to the transformed data.
>>> from scipy.stats import f_oneway >>> F, p = f_oneway(tx, ty) >>> p 0.1314139477040335
If we require that p < 0.05 for significance, we cannot conclude that the variances are different.