The Interquartile range (IQR) is the range of values in which the middle 50% of the scores are found. It's vital to remember that this meaning of "middle" differs from the one used to describe the mean. The median is the value in the "middle" of the distribution, with 50% of the scores bigger than the median and 50% of the scores smaller than the median. Thus, they are employed in the same data situations as the mean and standard deviation, except when the data are significantly non-normally distributed, the dependent variable's measurement scale is ordinal (rather than interval or ratio), or the sample size is too small. When the data are not normally distributed, not measured on an interval scale, and/or there is only a small sample, a summary of the distribution of scores (central and spread) for a variable is needed. Semi Interquartile Range = (Q 3– Q 1) / 2 The formula for Semi Interquartile Range is as follows: It's calculated as half the difference between the 75th percentile (Q 3) and the 25th percentile (Q 1).In simpler terms, semi-interquartile range refers to one-half of the difference between the first and third quartiles. Read More: Interquartile Range Formula: Definition, Formula and CalculationĪ measure of spread or dispersion is the semi-interquartile range. Q 3 refers to the third quartile of the series.Q 1 refers to the first quartile of the series.Interquartile Range = Upper Quartile – Lower Quartile = Q 3 – Q 1 Given below is the formula for the interquartile ranges: The Interquartile Range (IQR) is the difference between the first quartile and third quartile. To put it another way, the interquartile range encompasses the 50% of data points that fall between Q 1 and Q 3. The middle half of the data, between the upper and lower quartiles, is called the interquartile range. The highest quarter of values is represented by the upper quartile (Q 3). The smallest quarter of values in the data collection is covered by the lowest quartile (Q 1). Quarters are referred to as quartiles and they are labelled Q 1, Q 2, and Q 3 in order of low to high. Consider dividing your data into quarters to visualise the interquartile range. Interquartile Range gives the range of the middle half of a data set.
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