OriginLab Corporation - Data Analysis and Graphing Software - 2D graphs, 3D graphs, Contour Plots, Statistical Charts, Data Exploration, Statistics, Curve Fitting, Signal Processing, and Peak Analysis                     
 
Skip Navigation Links
All BooksExpand All Books
Origin HelpExpand Origin Help
StatisticsExpand Statistics
Descriptive StatisticsExpand Descriptive Statistics
Correlation Coefficient (Pro Only)Expand Correlation Coefficient (Pro Only)

17.1.10 Correlation Coefficient (Pro Only)

Introduction

The correlation coefficient is a numerical measure of the strength of the relationship between two random variables. The value of the correlation coefficient varies from -1 to 1. A positive value means that the two variables under consideration have a positive linear relationship (i.e., an increase in one corresponds to an increase in the other) and are said to be positively correlated. A negative value indicates that the variables considered have a negative linear relationship (i.e., an increase in one corresponds to a decrease in the other) and are said to be negatively correlated. The closer the value is to +1 or -1, the stronger the degree of linear dependence.

CorrelationCoeffient Report.png

Choosing a Correlation Test

  • Pearson's r Correlation
    This widely-used coefficient measures the strength of a linear association between variables.
  • Spearman's Rank Order Correlation
    The most common non-parametric measure, Spearman's is used when data are not normally distributed. Spearman's is a non-parametric equivalent of Pearson's correlation.
  • Kendall's tau Correlation
    Another non-parametric method, used when analyzing data with one or more ordinal variables. Kendall’s is relatively "robust" to outliers.
Correlation methods.png

Handling Missing Values

When there are missing values in your data, the Correlation Coefficient dialog provides the option to delete the cases pairwise or listwise.

Performing Correlation Coefficients

To open the Correlation Coefficients dialog box from the menu:

  • Select Statistics: Descriptive Statistics: Correlation Coefficient...

Topics covered in this section:

 

© OriginLab Corporation. All rights reserved.