Summary
Samenvatting Statistiek H7: De vorm van een verdeling
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Samenvatting hoofdstuk 7 statistiek (de vorm van een verdeling)
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DE VORM VAN DE VERDELINGVEEL FREQUENTIEVERDELINGEN HEBBEN NIET DE VORM VAN DE NORMALE
VERDELING:
- Andere welving (kurtosis)
- Scheef (skewness)
1 KURTOSIS
KURTOSIS = welving / gepiektheid (= hoe steil een verdeling is)
Steile piek = positieve Kurtosis ->
positief getal
Tussenin = normale Kurtosis -> getal 0
Platte piek = negatieve Kurtosis ->
KURT = 0: WELVING = NORMAALVERDELING:
KURT > 0: SCHERPE TOP:
KURT < 0 : AFGEPLATTE TOP OF DEUK:
, 2 SKEWNESS
SKEWNESS = scheefheid (= hoe scheef een verdeling is)
Linksscheef: lange staart links,
veel hoge scores rechts
Normaalverdeling: scores rond
het gemiddelde
Rechtsscheef: lange staart
rechts, veel lage scores links
SKW = 0 : SYMMETRISCHE VERDELING:
Modus = mediaan = gemiddelde
SKW < 0: LINKSSCHEVE VERDELING:
Modus > mediaan > gemiddelde
SKW > 0 : RECHTSSCHEVE VERDELING:
Modus < mediaan < gemiddelde
3 WANNEER IS DE VERDELING TE STEIL OF TE SCHEEF?
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