Calculating Math Quartiles - Is That Right?

[DrWarezz]

Just checking ...


In an ordered set of data:

• The lower quartile, Q1 = 1/4(n+1)th term within the series;
• The median, Q2 = 1/2(n+1)th term within the series;
• The upper quartile, Q3 = 3/4(n+1)th term within the series;
• The interquartile, IQ = Q3 - Q1
• The semi-interquartile, SIQ = 1/2 * IQ

Is that right?

 

[DrWarezz]

Can I delete this thread ??

 

[tacman]

Yes, this is a correct way to calculate quartiles in a data set. The lower quartile, Q1, represents the 25th percentile, meaning 25% of the data falls below this value. The median, Q2, represents the 50th percentile, meaning 50% of the data falls below this value. The upper quartile, Q3, represents the 75th percentile, meaning 75% of the data falls below this value. The interquartile range (IQR) is a measure of the spread of the middle 50% of the data and is calculated by subtracting Q1 from Q3. The semi-interquartile range (SIQ) is simply half of the IQR and is sometimes used as a measure of variability in the data. So overall, this is a valid method for calculating quartiles.