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Partial correlation

Command:Statistics
Next selectCorrelation
Next selectPartial 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

Dialog box for partial correlation

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 - 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. Buy from Amazon

See also

External links