Summary
Samenvatting Commando's STATA Onderzoeksmethoden Schakeljaar Handelswetenschappen
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Commando's STATA Onderzoeksmethoden Schakeljaar Handelswetenschappen
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By: mathiasmenez12 • 2 year ago
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How to – STATAData observeren en interpreteren
Commando’s:
- Sum
- Sum, detail
- Codebook
- Des // overzicht van de variabelen
- Histogram
o Grcomb histogram Y X1 X2, v(1)
- Graph box
- Scatter Y X1 X2
- Graph matrix Y X1 X2
Outliers opmerken
Commando’s:
- Rvfplot
o , mlabel() voor observatie te bekijken
o , name() voor de grafiek een naam te geven
- Avplots
- Dfbeta // Stata geeft de verandering voor elke coëfficiënt weer
- Sum dfbeta // vuistregel: grenswaarde -1 en 1, alles erbuiten zijn outliers
Residu’s
Normaalverdeling van de residu’s
Commando’s:
- Kdensity res
- Swilk res // H0 : residu’s zijn normaal verdeeld (p-waarde hoger dan 5% is goed)
- Sktest res
Residu’s aanmaken
Commando’s:
- Predict stud_res, rstud // stud_res is de naam
- Predict fitted, xb // fitted values aanmaken
Significantie van parameters
Commando’s:
- Lincom lnP--1 // je wil testen t.o.v. -1
o Lincom lnP-1 // je wil testen t.o.v. 1
- Test (2.EDUC=0) (3.EDUC=0) (4.EDUC=0) // significantieniveau van meerdere variabelen
- Test (2.EDUC = 3.EDUC = 4.EDUC) // significant verschillend van elkaar of niet?
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