How effective are lexical richness measures for differentiations of vocabulary proficiency? A comprehensive examination with clustering analysis

Language Testing in Asia

Table 2 Background information of the CFL learners

Number of participants		28
Education		College and above
	Range	20–43
Age (years)	Mean	27
	Standard deviation	4.5
	Range	0–4
Chinese learning experience (years)	Mean	2.4
	Standard deviation	0.9