Ratio of two contrasts, i.e. sum(contrast1*beta)/sum(contrast2*beta).

effect_contrast_ratio(contrast1, contrast2)

## Arguments

contrast1 First contrast weights, a vector with the same length as the number of columns in the design matrix. Second contrast weights, a vector with the same length as the number of columns in the design matrix. sum(contrast2*beta) should always produce a positive value.

## Value

An object defining how to calculate an effect size.