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Samenvatting - Statistiek (handleiding)

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Oefeningen in SPSS: beschrijvende en toetsende statistiek Gegeven in het schakeljaar verpleeg- en vroedkunde (2024) Statistiek door Professor A. Alonso Abad

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STATISTIEK OEFENINGEN
Inhoudsopgave
STATISTIEK OEFENINGEN ......................................................................................... 1
Data .................................................................................................................... 2
Excel file ........................................................................................................... 2
Soorten variabelen ............................................................................................ 2
Data manipulatie .................................................................................................. 2
Labelen ............................................................................................................ 2
Transformeren .................................................................................................. 3
Discretiseren .................................................................................................... 5
Beschrijvende statistiek ........................................................................................ 7
Kwalitatieve variabelen ...................................................................................... 7
Kwantitatieve variabelen .................................................................................... 8
Figuren .............................................................................................................. 11
Kwalitatieve variabele ...................................................................................... 11
Kwantitatieve variabele.................................................................................... 15
Outline .............................................................................................................. 18
Betrouwbaarheidsintervallen ........................................................................... 18
Hypothesetoetsing: One sample T-test ............................................................. 21
Hypothesetoetsing: Ongepaarde T-test ............................................................. 28
Outline .............................................................................................................. 33
Descriptieve statistiek voor samenhang ............................................................ 33
Gepaarde t-test............................................................................................... 35
Pearson Correlatie test .................................................................................... 42
Enkelvoudige lineaire regressie ............................................................................ 45
Onderzoeksvraag ............................................................................................ 45
ANOVA ........................................................................................................... 45
Model ............................................................................................................. 46
Oefening 1 ...................................................................................................... 47
Oefening 2 ...................................................................................................... 50

1

,Data


Excel file



• Elke regel is een persoon
• Elke kolom is een variabele




Soorten variabelen
• Kwalitatief
o Nominaal → heeft geen orde
o Ordinaal → heeft een rangorde
• Kwantitatief = in SPSS geen onderscheid tussen ratio of interval
o Ratio → absoluut nulpunt
o Interval → geen absoluut nulpunt



Data manipulatie


Labelen
• Via Variable view → Values




2

, • Je krijgt dit venster door op de 3 puntjes te klikken in de kolom ‘Values’
• Om labels toe te voegen klik je op dit kruisje
o Zo kan je in het vak ‘Value’ het cijfer ingeven waarvoor je een label wilt
toevoegen.
o In het vak ‘Label’ voeg je dan het woord in.
• Als alles is toegewezen druk je op OK


Transformeren
• Via Transform → Compute variable




3

, • Na het klikken op ‘Compute Variable’ kom je op dit venster uit
• In het vak ‘Target Variable’ schrijf je de nieuwe naam van de variabele wat hier
dus ‘log_L’ is.
• In het vak ‘Numeric Expression’ schrijf je dan ‘LN(L)’. Hier staat de L tussen
haakjes omdat het over de variabele L gaat.
o Een ander voorbeeld kan zijn
▪ ‘Target Variable’ → ‘log_G’
▪ ‘Numeric Expression’ → LN(G)
• Na het invullen klik je op OK



• Als je alle stappen hierboven hebt uitgevoerd en je gaat naar ‘Variable View’ zie je
dat er een nieuwe variabele is toegevoegd. Dit is nu de getransformeerde variabele
van L.
• Ook in in ‘Data View’ is er een nieuwe variabele toegevoegd




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