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Samenvatting Spss toetsen
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Werkwijze van SPSS voor criminologie UGENT 3e bachelor
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SPSSH4: 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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