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Data Analyse | Notes

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  • January 25, 2021
  • 9
  • 2019/2020
  • Class notes
  • Jules ellis
  • All classes
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Data Analyse
Data analyses (continue AV’s):

Histogram (5 getallen-resumé)
Kruistabel
Een sample t-toets: één enkele populatie wordt vergeleken met een standaard (IQ)
t-toets voor onafhankelijke steekproeven: twee populaties worden met elkaar
vergeleken (1 OV (twee niveaus; kwantitatief) & 1 AV)
t-toets voor gekoppelde paren: een populatie die met zichzelf vergeleken wordt (1
OV (twee niveaus), within-subject factor & 1 AV)
Simpele regressie (correlatie): 1 OV (twee of meer niveaus; kwalitatief) & 1 AV
1-factor ANOVA: 1 OV (twee of meer niveaus; kwantitatief) & 1 AV
1-factor repeated measures ANOVA: 1 OV (twee of meer niveaus) & within-subject
factor & 1 AV
2 – factor ANOVA (univariate): 1 of meer OV’s (kwantitatief) & 1 AV
ANCOVA (univariate): 1 of meer OV’s (kwantitatief of kwalitatief) & 1 AV
Multiple regressie analyse (univariate): 1 of meer OV’s (kwalitatief) & 1 AV
Repeated measures MANOVA: 1 of meer OV’s & within-subject factor & 1 AV
MANOVA (multivariate): 1 of meer OV’s & meer dan 1 AV
Dubbel multivariate repeated measures ANOVA: 1 of meer OV’s & within-subject
factor & meer dan 1 AV
Non-parametrische toetsen

Kwalitatief = categoriaal = factor
Kwantitatief = continu = covariaat

, Lecture 1 (14-4-2020):

Data preparatie:

Conversion: tekst bestand/excel bestand  SPSS bestand
- Tekst  SPSS: delimited (.csv) = separated: comma, semicolon
(puntkomma), tab & fixed = separated by columns
- Excel  SPSS: ‘file  Open  Data  excel’
Merging: koppelen van bestanden (2 SPSS bestanden  1 SPSS bestand)
- SPSS: Data > merge files > add variables > ‘selecteer
degenen die je wil koppelen’ > ‘one-to-one/one-to-
many’ > ‘select lookup table’ > ‘Key variables’
- ‘add cases’ (over dezelfde variabelen, maar andere
personen) & ‘add variables’ (over dezelfde personen
(key variable) maar verschillende variabelen)
- Key variable: String variabele = tekst (links uitgeleind)
& Numeric variable = getal (rechts uitgeleind). 2
spaties VS 1 spatie. String 8 VS string 9. Numeric 8 VS numeric 9. Missing id.
File contention problem (computer opnieuw opstarten)
Aggregate: van een micro niveau (individuele score) naar macro niveau (totaalscore)
- SPSS: Data > Aggregate > ‘break variable’ (groep/cases) > ‘aggregated
variables’. ‘function’ (mean, SD, etc.)
Restructure: lange data (within-subject factor onder elkaar) en brede data (within-
subject factor naast elkaar)
- Lang  breed = cases into variables & Breed  lang = variables into cases
- Identifier = nummer van subject (case) & Index = within-subject factor & Target
= afhankelijke variabele
- SPSS: Data > restructure > ‘variables into cases/cases into variables’

Lecture 2 (21-4-2020) – power and effect size:

Power analyse:
power is de kans dat een significantietest de nulhypothese terecht verwerpt, gegeven
dat de alternatieve hypothese waar is.

Error types:
- Type 1 fout: als de nulhypothese goed is, maar toch verworpen wordt. 
verkeerde steekproef (niet representatief) = significantie level
- Type 2 fout: als de nulhypothese fout is, maar toch behouden wordt

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