Compute Standardized Mean Differences
Checks whether a vector has more than two unique values
Compute the standardized mean difference
Compute components of SMD
Computes SMD variance
Apply a function pairwise along a list
Compute n, mean and variance
Compute Standardized Mean Difference
Helper to clean up smd output
Variance computations
Computes standardized mean differences and confidence intervals for multiple data types based on Yang, D., & Dalton, J. E. (2012) <https://support.sas.com/resources/papers/proceedings12/335-2012.pdf>.