Description Usage Arguments Details Value Author(s) References See Also Examples
Function to enable theory evaluation, as introduced by Ragin (1987, p.118)
and extended Schneider & Wageman (2012, p.295), by producing parameters of fit
for all possible intersections between a given theoretical statement (a SOP
expresison) and the solutions found by function minimize()
.
1 | modelFit(model, theory = "")
|
model |
A minimization object of class |
theory |
Character, a SOP expression. |
Following Ragin's (1987) original work, theory evaluation amounts to intersecting a theoretical expectation with a model resulting from a minimization process.
There are in fact four intersections: presence - presence, presence - absence,
absence - presence and absence - absence, where by “absence” is actually
meant a negation of an expression using the function negate()
.
When multiple models exist, all of them are automatically detected, negated and intersection with the theory. Intersections and parameters of fit are going to be produced using a single theoretical expression.
A list containing objects of class "QCA_pof"
with the parameters of fit. For a
single theoretical expression and a single model, the object is a simple
"QCA_pof"
object.
Adrian Dusa
Ragin, C.C. (1987) The Comparative Method: Moving beyond Qualitative and Quantitative Strategies. Berkeley: University of California Press.
Schneider, C.Q.; Wagemann, C. (2012) Set-Theoretic Methods for the Social Sciences: A Guide to Qualitative Comparative Analysis (QCA). Cambridge: Cambridge University Press.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | # Lipset fuzzy version data
ttLF <- truthTable(LF, outcome = SURV, incl.cut = 0.8)
# parsimonious solution
pLF <- minimize(ttLF, include = "?")
modelFit(model = pLF, theory = "DEV*STB")
# hypothetical exploration of intermediate solutions
iLF <- minimize(ttLF, include = "?", dir.exp = "1,0,0,0,0")
modelFit(iLF, "DEV*STB")
|
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