1. Abberger K (1997) Quantile smoothing in financial time series. Stat Pap 38:125–148
2. Burke CJ (1953) Additive scales and statistics. Psychol Bull 60:73–75
3. Carifio J, Perla RJ (2007) Ten common misunderstandings, misconceptions, persistent myths and urban legends about likert scales and likert response formats and their antidotes. J Soc Sci 3:106–116
4. Hassler U (2018) Sample quantiles for ordinal data, Social Science Research Network Working Paper,
https://ssrn.com/abstract=3237945
5. Hays WL (1963) Statistics for psychologists. Holt, Rinehart & Winston, New York