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“Gilborn et al. have described how the provision of too few ethnic categories [too much lumping] produces meaningless results but the provision of too many categories [too much splitting] can be almost as bad. … [with too few people in each category] the school reported no significant difference in attainment between ethnic groups.” — Kevin Guyan
Gilborn et al. have described how the provision of too few ethnic categories [too much lumping] produces meaningless results but the provision of too many categories [too much splitting] can be almost as bad. … [with too few people in each category] the school reported no significant difference in attainment between ethnic groups.