Some measures of dispersion depend upon the spread of values, whereas some calculate the variation of values from a central value. Do you agree?

Yes, it is true that some measures of dispersion depend upon the spread of values, whereas some calculate the variation of values from the central value. Range and quartile deviation measure the dispersion by calculating the spread within which the value lie. Mean deviation and standard deviation calculate the extent to which the values differ from the average or the central value.