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Wat is het verschil tussen correlatie en partiële correlatie? CH.12

Samengestelde samenvatting, gebaseerd op hoofdstuk 12 van SPSS Survival Manual van Pallant, 6e druk uit 2016.

De partiële correlatie lijkt op Pearson r, met als verschil dat je bij de partiële correlatie kan controleren voor een aanvullende (confound) variabele.

12.1 Wat is de procedure voor de partiële correlatie?

  1. Klik in het menu bovenaan het scherm op Analyze, selecteer vervolgens Correlate en daarna Partial.

  2. Klik op de twee continue variabelen die je wilt correleren. Klik op de pijl om deze variabelen naar de Variables box te verplaatsen.

  3. Klik op de variabele waarvoor je wilt controleren en verplaats deze naar de Controlling for box.

  4. Klik op Options.

    • Klik in het Missing Values gedeelte op Exclude cases pairwise.

    • Klik in het Statistics gedeelte op Zero order correlations.

  5. Klik op Continue en daarna op OK (of op Paste om de Syntax Editor op te slaan).

12.2 Hoe interpreteer je output van partiële correlatie?

In de output staat een tabel die bestaat uit twee gedeelten. In de bovenste helft vind je de normale Pearson product-moment correlatiematrix waarbij niet wordt gecontroleerd voor de mogelijke confound variabele. In de tweede helft van de tabel worden dezelfde correlatieanalyses herhaald, maar nu wordt wel gecontroleerd voor de mogelijke confound variabele. Door de twee correlatiecoëfficiënten met elkaar te vergelijken kun je achterhalen of het rekening houden met de aanvullende variabele invloed heeft gehad op de relatie tussen je twee variabelen.

 

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