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Samenvatting Spss toetsen

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Werkwijze van SPSS voor criminologie UGENT 3e bachelor

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SPSS
H4: DATABEHEER
Frequentietabel Analyze  Descriptive statistiscs 
Frequencies

Selecteren cases Data  Select cases  if condition is satisfied:
if …
Subgroepen vergelijken Data  Split file: compare groups




H5: VARIABELEN BEWERKEN
Bestaande variabelen hercoderen Transform  Recode into different variables

Nieuwe variabelen Transform  Compute variale: (vb) … - … of … +


Schaalvariabelen aanmaken Transform  Compute variable: mean (… , …)

Interne consistentie van een schaal bepalen Analyze  Scale  Reliability Analysis
- Model: alpha
- Statistics: scale if item deleted

Voorkomen bepaalde waarden over Transform  Count values within cases
verschillende variabelen tellen

Variabelen standaardiseren Analyze  Descriptive statistics  Descriptives:
save standardized values as variables




H6: NUMERIEKE MATEN VAN DATA
Numerieke maten opvragen Analyze  Descriptive statistics  Frequencies
 Statistics

Betrouwbaarheidsintervallen Analyze  Descriptive statistics  Explore 
statistics: 95%




H7: GRAFISCHE VOORSTELLINGEN
Univariate statistiek Analyze  Descriptive statistics  Frequencies
 Charts: pie chart, bar chart, histogram (show
normal curve)

, Multivariate statistiek Graphs  Legacy Dialogs  Boxplot (simple)

H9: KRUISTABELLEN
Chi-kwadraat toets Analyze  Descriptive statistics  Crosstabs
- Stat: chi-square, phi & cramer’s V
Toetsingsgrootheid: X 2 -waarde - Cells: observed counts & column
percentages
Effectgrootte:
- Cramer’s V (r x k tabel)
- Phi (2x2 tabel)
Partitioneren = opdelen kruistabel in 2x2 Data  Select cases: … = 1| … = 2
kruistabellen Data  Select cases: … = 1 | … = 3
Data  Select cases: … = 2 | … = 3
(na elke selectie chi-kwadraat opvragen!)

Fisher-Exact-toets Analyze  Descriptive statistics  Crosstabs
- Stat: chi-square, phi & cramer’s V
- Cells: observed counts & column
percentages

McNemar toets Analyze  Nonparametric tests  Legacy
Dialogs  2 Related Samples: McNemar
Toetsingsgrootheid: X 2 -waarde
Geen goede maat van effectgrootte



H10: TWEE GEMIDDELDEN VERGELIJKEN
Onafhankelijke t-toets (& boxplot) Analyze  Compare means  independent
samples t-test (define groups (vb 0 en 1)
- Estimate effect sizes

Toetsingsgrootheid: t-waarde Graphs  Legacy Dialogs  Boxplot
Effectgrootte: Cohen’s d - Simple
- Summaries for groups of cases

Mann-Whitney toets Analyze  Nonparametric tests  Legacy
Dialogs  2 independent samples: Mann-
Toetsingsgrootheid: U-waarde Whitney U (define groups)
Effectgrootte:

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October 3, 2023
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