Summary

Samenvatting STATA - Statistiek II

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Course
Statistiek II

Institution
Universiteit Antwerpen (UA)

In deze samenvatting vind je de commandos voor het uitvoeren van regressies in stata. Alle onderdelen van de werkcolleges zijn samengevat in duidelijke stappen. Dit helpt bij het maken van de oefeningen en bij het studeren voor het examen.

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Uploaded on August 8, 2024
Number of pages 18
Written in 2023/2024
Type Summary

regressie
stata
padanalyse
principale componentenanalyse

Institution
Universiteit Antwerpen (UA)
Education
Sociaal - economische wetenschappen
Course
Statistiek II

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Stata & Theorie (WC en HC) - Statistiek II

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1. Summary - Samenvatting multivariate analyse - statistiek ii
2. Summary - Samenvatting stata - statistiek ii
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Inhoud
WC1 – inleiding.......................................................................................................................................3
WC2 – datamanipulatie..........................................................................................................................3
WC3- samenhang & statistische controle...............................................................................................4
Samenhang.........................................................................................................................................4
Tabelsplitsing......................................................................................................................................4
WC5 – covariantie, correlate & bivariate regressive...............................................................................4
Samenhang.........................................................................................................................................4
Scatterplot......................................................................................................................................4
Covariantie & Pearson product-moment correlatiecoëfficiënt.......................................................4
Bivariate regressie..............................................................................................................................5
Regressierechte..............................................................................................................................5
Bivariate regressie..........................................................................................................................5
WC6 – meervoudige regressie................................................................................................................6
Voorbereidende bivariate analyses.....................................................................................................6
Gegevens en operationalisering.....................................................................................................6
Meervoudige regressie.......................................................................................................................7
Stijging in verklaarde variantie opvragen........................................................................................7
WC7 – regressiediagnostiek....................................................................................................................7
Schending lineariteitsassumptie.........................................................................................................7
Additiviteistassumptie........................................................................................................................7
Multicollineariteit...............................................................................................................................7
Homoskedasticiteit.............................................................................................................................8
Normaliteitsassumptie.......................................................................................................................8
Outliers en hefboompunten...............................................................................................................8
WC8 - Dummy-regressie.........................................................................................................................9
Dummy-regressie................................................................................................................................9
Modellen met interactie.....................................................................................................................9
WC9 – Variantie-analyse.........................................................................................................................9
Van t-test naar variantie-analyse........................................................................................................9
One-way analysis of variance............................................................................................................10
Bonferroni post-hoc test...................................................................................................................11
N-way analysis of variance en analysis of covariance.......................................................................11
Effectcodering...................................................................................................................................12
WC10 – Logistische regressie................................................................................................................13

1

, Logistische regressie.........................................................................................................................13
Hosmer-lemeshow test.....................................................................................................................13
WC11 – Padanalyse..............................................................................................................................14
WC11 – multinominal logit modellen...................................................................................................14
Multinominale regressie...................................................................................................................14
WC12 – Principale componentenanalyse & PFA...................................................................................15
Principale componentenanalyse.......................................................................................................15
Rotatie van de componenten............................................................................................................15
Orthogonale rotatie......................................................................................................................15
Oblieke rotatie..............................................................................................................................17
Betrouwbaarheidsanalyse (Cronbach’s Alpha).................................................................................17
Somscores.........................................................................................................................................18
Zelf somscore aanmaken..............................................................................................................18
Factorscores laten bereken door stata..........................................................................................18

2

, WC1 – inleiding
Verwijderen van een variabele drop …

Frequentietabel opvragen tab1 …, miss

Histogram maken graphics > histogram

o Y- axis : frequency
o Bar properties
o Normaalcurve toevoegen: density plot
o Titel toevoegen

Gemiddelde bepalen summarize …

o Opgelet ! code 9999 wordt meegerekend
o Oplossing: code 9999 omzetten naar missing value mvdecode …, mv(9999)

Kwartielen opvragen tabstat …, statistics (p25 p50 p75)

WC2 – datamanipulatie
Centreren van een variabele + nieuwe variabele aanmaken

o Gemiddelde bepalen summarize …
o Nieuwe variabele aanmaken generate … = … - gemiddelde

Variabele hercoderen naar categorieën recode … (…=0)(…=1), generate (…)

Gemiddelde indien filter summarize … if …

Variabele standaardiseren

o Gemiddelde & standaardafwijking bepalen summarize ….
o Nieuwe variabele aanmaken generate … = (…-gem)/st.afw.)

Variabele dummificiëren

o Nieuwe variabele aanmaken recode …, generate (…)

Schaal aanmaken

o Freq. Tabel opvragen van alle variabelen tab1 …, miss
o Waarde als missing definiëren mvdecode …, mv(…)
o Schaal omkeren recode …, prefix (rev_...)
o Aantal valide waarde bepalen egen float … = rowmean(rev_...) if…
o Schaalvariabele aanmaken egen float … = rowmean(…) if …

3

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