CONceptualizing: intensions and extension of constructs

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Presentation transcript:

CONceptualizing: intensions and extension of constructs

AIM Intension and extension of constructs Two (of four) relationships between constructs and facets: Necessary and Sufficient Family resemblance (sufficiency)

EXAMPLE: CONCEPTUALIZING A ‘POOR NEIGHBORHOOD’ Dichotomous variable ‘(not a) poor neighborhood’

‘CONSTRUCTS’ CONSIST OF ‘FACETS’ variable Construct/Concept/Term variable variable

EXAMPLE: POVERTY OF NEIGHBORHOODS Facets Average income of inhabitants Construct/Concept/Term Average education level of inhabitants Poor neighborhood or not Quality of houses

RELATING FACETS AND TERMS Four types of relationships: (Missing: a set of related concepts) (Not: creating (matrix) typologies) And: necessary and sufficient conditions Or: family resemblance

EXAMPLE: POVERTY OF NEIGHBORHOODS Facets Average income of inhabitants Lowest 10% or not and Construct/Concept/Term Average education level of inhabitants Poor neighborhood or not Over 20% only basic level of education (or not) and De grenswaarde bepaalt ook de intensie van het begrip, … dus naar 20% doet ook de extensie stijgen …. and At least 20% should be renovated (or not) Quality of houses

EXAMPLE: POVERTY OF NEIGHBORHOODS Facets Average income of inhabitants Lowest 10% or not or Construct/Concept/Term Average education level of inhabitants Poor neighborhood or not Over 20% only basic level of education (or not) or De grenswaarde bepaalt ook de intensie van het begrip, … dus naar 20% doet ook de extensie stijgen …. or At least 20% should be renovated (or not) Quality of houses

INTENSION AND EXTENSION Intension: number & characteristics of facets of a term Extension: number of units to which a term applies

EXAMPLE: POVERTY OF NEIGHBORHOODS Facets Average income of inhabitants Lowest 10% or not and Construct/Concept/Term Average education level of inhabitants Poor neighborhood or not Over 20% only basic level of education (or not) and De grenswaarde bepaalt ook de intensie van het begrip, … dus naar 20% doet ook de extensie stijgen …. and At least 20% should be renovated (or not) Quality of houses

EXAMPLE: POVERTY OF NEIGHBORHOODS Number of poor neighborhoods based on income only Number of poor neighborhoods based on income and education (Number of units) Number of poor neighborhoods based on income, education and quality of houses = “Extension” Leuk idee van PJ: kun je ook met Venn-diagrammen doen! 1 2 3 Number of facets = “Intension”

INTENSION AND EXTENSION IF necessary and sufficient relationships are assumed (= AND) … Intension increases (the number of facets increases) Extension (number of units it applies to) decreases

FAMILY RESEMBLANCE ‘Or’ relationship (family resemblance) Units can be different with respect to the facets they have, but they also ‘share’ something.

POVERTY OF NEIGHBORHOODS Facets Average income of inhabitants or Construct/Concept/Term Average education level of inhabitants Poor neighborhood or not or or Quality of houses

INTENSION AND EXTENSION Number of poor neighborhoods based on income Concepts defined using family resemblance Number of poor neighborhoods based on income, or education or housing quality (Number of units) = “Extension” Number of poor neighborhoods based on income or education 1 2 3 Number of facets = “Intension”

THIS MICROLECTURE Necessary and Sufficient relationships Family resemblance Intension and extension of concepts