Psychometrie SPSS stappenplan (samenvatting)

Algemeen
Statistics report
Analyze → Descriptive Statistics → Descriptives → Choose variables → Options: mean, std.
Deviation, minimum, maximum

Frequencies
Analyze → Descriptive Statistics → Frequencies → Choose variables

Summary
Analyze → Descriptive Statistics → Descriptives → Choose variables

Z-score
Analyze → Descriptive Statistics → Descriptives → Choose variables → ‘Save standardized values as
variables’ → OK

Regression line scatterplot
Dubbelklik scatter plot → Chart Editor → Add Fit Line at total → Lineair → Add fit line to subgroups
→ Dubbelklik → Lineair

Distribution scores
Analyze → Descriptive Statistics → Frequencies → Choose variables → Charts: Histogram

Som (total scores)
Transform → Compute variable → Target variable: naam → Numeric expression: SUM.n (variable1
TO variable.p)


Scaling & norming
Scale score
Transform → Compute Variable → MEAN.n (variable1 to variable.p) → name target variable
• n = minimaal aantal items dat moeten zijn ingevuld

T-score
Transform → Compute Variable → Target variable: name → Numeric expression: ([Z-score]*10)+50



Percentilescore
Transform → Rank Cases → Choose variable → Rank Types: only ‘Fractional rank as %’ → Ties: high



Norm table
Analyze → Reports → Case Summaries → Variables box: normed scores (P-score, T-score, Z-score) →
Grouping variables box: scale score → Uncheck ‘Display Cases’ → Statistics: drag mean to cell
statistics to ask for cell means & drag number of cases to statistics → Continue