Transform the reference values to achieve a normal distribution.
You should transform the data when the distribution does not match the assumptions of the quantile estimator. If you cannot transform the distribution to meet the assumptions of the estimator you should consider using another estimator.
We've been developing intuitive high-quality statistical software at an affordable price, backed up by fast friendly customer service for over 25 years...
Office hours: 9am-5pm GMT Mon-Fri
It's Tuesday 5:02 PM and the office is closed - e-mail us and we'll get back to you as soon as possible.