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Volledige psychometrie samenvatting SPSS & R (22/23)

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Deze samenvatting/spiekbrief omvat de 8 weken practica van het vak Psychometrie. Het is gemaakt met de correcte antwoorden(filmpjes) ernaast en er is relevante informatie uit het college toegevoegd. Ook heb ik er plaatjes voor visuele ondersteuning in gezet.

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  • November 6, 2022
  • 16
  • 2022/2023
  • Summary
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Psychometrie SPSS Spiekbrief
Week 1

Schaalscores berekenen:

 Transform  Compute variable
o Target Variable = *naam geven; bv. lokfa_mean*
o Numeric expression = MEAN.n(… TO …)
 ‘n’ zelf bepalen
 alleen TO of , gebruiken




Relevante statistieken/report over onderzoeksgroep:

 Analyze  Descriptive Statistics  Descriptives …
 Schaalscores (bv. lokfa_mean etc.) naar de ‘Variable’s’
 Vervolgens Options  *mean, standard deviation, minimum en maximum
aanvinken*

Grafieken maken van de verdeling van de schaalscores:

 Graph  Legacy Dialogs  Histogram (of via ‘Chart Builder’)
 Schaalscore (bv. lokfa_mean) naar ‘Variable’

Schaalnormen maken:

Z-scores berekenen:

 Analyze  Descriptive Statistics  Descriptives
 Relevante variabele(n) (bv. lokfa_mean) naar ‘Variable(s)’
 ‘Save standardized values as variables’ selecteren
o De waarden zijn redelijk als de meesten tussen de -3 en 3 zijn; gecentreerd
rond het gemiddelde (=0) met 3 sd’s (sd=1)

,T-scores berekenen:

 Transform  Compute variable…
 Tscore = 10*z-score + 50
o Dus Numeric expression = 10*ZLokfaMean + 50
o De waarden zijn redelijk als de meeste tussen de 20 en 80 zijn; gecentreerd
rond het gemiddelde (mean=50) met 3 sd’s (sd=10)




Percentielscores berekenen:

 Transform  Rank Cases…
 Schaalscores (bv. lokfa_mean etc.) naar ‘Variable(s)’
o Rank Types  ‘Rank’ deselecteren & ‘Fractional rank as %’ selecteren
o Ties  ‘High’ selecteren
o Eventueel aantal decimalen aanpassen in Variable View
o De nieuwe waarden zijn redelijk als ze tussen de 0 en 100 liggen

, Normtabel maken:

 Analyze  Reports  Case Summaries…
 De 3 normscores naar ‘Variables’ en de schaalscore (bv. lokfa_mean) naar
‘Grouping Variable(s)’
o ‘Display cases’ deselecteren
o ‘Statistics’  ‘Mean’ van ‘Statistics’ naar ‘Cell Statistics’ verplaatsen

 ‘Number of Cases’ naar ‘Statistics’

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