Editing Level of measurement (section)

====Central tendency====
The [[mode (statistics)|mode]], i.e. the ''most common'' item, is allowed as the measure of [[central tendency]] for the nominal type. On the other hand, the [[median]], i.e. the ''middle-ranked'' item, makes no sense for the nominal type of data since ranking is meaningless for the nominal type.<ref>{{cite journal|last1=Manikandan|first1=S.|title=Measures of central tendency: Median and mode|journal=Journal of Pharmacology and Pharmacotherapeutics|date=2011|volume=2|issue=3|pages=214–5|doi=10.4103/0976-500X.83300|pmc=3157145|pmid=21897729 |doi-access=free }}</ref>