Partial correlation

Command:

Statistics Correlation Partial correlation

Description

Use Partial correlation when you suspect the relationship between 2 variables to be influenced by other variables. The partial correlation coefficient is said to be adjusted or corrected for the influence by the different covariates.

Required input

Variable Y - Variable X

Select the 2 variables of interest.

Covariates

The variables that you suspect to influence the relationship between the X and Y variables.

Select

(Optionally) enter a filter in order to include only a selected subgroup of cases in the statistical analysis.

Options

You can select a Logarithmic transformation for one or both variables.

Results

Partial correlation

Variable Y	GRADE_A
Variable X	ATP

Covariates
CONCENTRATION
MORPHOLOGY

Sample size	46
Correlation coefficient r	0.1805
Significance level	P=0.2410

The results window for Partial correlation displays:

• Sample size: the number of (selected) data pairs
• Correlation coefficient: Partial correlation coefficient, with P-value

Literature

• Altman DG (1991) Practical statistics for medical research. London: Chapman and Hall.

See also

• Multiple regression

External links

• Partial correlation on Wikipedia.