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.
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 …
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