# How to Calculate Interquartile Range (IQR) and Semi-interquartile Range or Quartile Deviation

Interquartile Range

Interquartile range (IQR) is a measure of spread, based on quartiles, that still maintains the idea of range, but is not influenced by

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# How to Calculate Interquartile Range (IQR) and Semi-interquartile Range or Quartile Deviation

# Karl Pearson’s Coefficient Method (Correlation)

# Scatter Diagram Method (Correlation)

# Correlation – Definition, Types, Methods of Measurements

# Mean Deviation The Absolute Measure of Dispersion

# Quartile Deviation the Absolute Measure of Dispersion

Interquartile Range

Interquartile range (IQR) is a measure of spread, based on quartiles, that still maintains the idea of range, but is not influenced by

Karl Pearson’s Coefficient Method

Karl Pearson’s method of coefficient of correlation is also known as Pearsonian coefficient or correlation or product correlation method.

Let X

Scatter Diagram Method

Scatter Diagram Method is the simplest method of studying the correlation between two variables. In this method the values of one of

Correlation

Correlation is a statistical tool used to study the relationship between two or more variables. Two variables are said to be correlated if the

Mean Deviation Definition

Mean deviation is defined as the mean of absolute deviations of the values from the central value.

For individual series:

\[MD\left( \overline{X}

Definition of Quartile Deviation

Quartile Deviation divides the total frequency in to four equal parts. The lower quartiles Q1 refers to the values of variates