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In descriptive statistics, the interquartile range (IQR), also called the midspread or middle fifty, is a measure of statistical dispersion, being equal to the difference between the upper and lower quartiles, IQR = Q 3 â Q 1.n descriptive statistics, the interquartile range (IQR), also called the midspread or middle fifty, is a measure of statistical dispersion, being equal to the difference between the upper and lower quartiles, IQR = Q 3 â Q 1.
Originally, the differences between mental age and chronological age were used to compute the intelligence quotient, or IQ. mental age Ã· Physical age Ã 100 = IQ. No matter what the child's chronological age, if the mental age is the same as the chronological age, then the IQ will equal 100. Modern intelligence tests, including the current Stanford-Binet test, no longer compute scores using the IQ formula.