ARMS Advanced Research Methods And Statistics (201900076)
Summary
Samenvatting ARMS Practical 1: Know Your Data
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Course
ARMS Advanced Research Methods And Statistics (201900076)
Institution
Universiteit Utrecht (UU)
In dit document staat een complete samenvatting van alle analyses die je moet kennen voor het ARMS practical 1 Know Your Data. Alle analyses staan uitgelegd hoe je deze stapsgewijs moet uitvoeren in SPSS en vervolgens staat er ook stapsgewijs hoe je de output moet interpreteren. Ook staat er aangeg...
, Opdracht 1 (1 conditie in 2 groepen -> between subjects design)
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To this end, they examine how quickly rats learn to find their way through a
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exit to that of a group of rats that have received a placebo.
Let op bij between design in spss: grouping variabele maken
spss: eerst assumpties testen ->
> Descriptive statistics -> explore en dan bij plots ‘histogram’ en ‘normality
plots with tests’ aanklikken.
> Dan kijken naar de smirnov p-waarde wanneer sample >2000,
> Kijken naar shapiro-wilk wanneer sample <2000.
> Wanneer de p-waarde significant is, is er niet voldaan aan de voorwaarde van
normale verdeling.
Wat te doen wanneer het dus niet normaal verdeeld is? Geen t-test mag je dan
doen, dus dan moet je: non-parametrisch toetsen
non-parametrisch toetsen:
> Analyze > nonparametric tests > legacy dialogs > 2 independent samples >
waarden invullen > define groups > Mann-whitney
u test aanklikken & exact > exact
aflezen:
> Verschil in medianen (bereken in excel)
Mann-Whitney U test:
Z-waarde = -2.025
P-waarde = 0.043
Effect-size (Z / wortel N) = 2.025 / wortel 42
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