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This is too vague.
>is the statistical dispersion of velocities about the mean velocity
Statisticians use several different measures of dispersion: the range, the standard deviation, the variance, the interquartile range. There's no indication of which one of these is used in astronomy as the velocity dispersion. Blaise ( talk) 18:55, 6 April 2013 (UTC)
The second paragraph starts with "This relationship takes several forms..." but it's not clear what relationship we are talking about, since no mention of any relationship was made prior to that sentence. AxelBoldt ( talk) 23:05, 16 September 2015 (UTC)
the linked article doesn't have the word 'poor' in it anywhere. Perhaps the language of that article - Group 0, to Group 5, would be better. -- 2607:FEA8:D5DF:1AF0:89E4:B3DB:7CD7:65FD ( talk) 11:31, 9 October 2020 (UTC)