quasiconcavity | R Documentation |
Test wether a function is quasiconcave or quasiconvex.
The bordered Hessian of this function is checked by
quasiconcavity
() or quasiconvexity
().
quasiconcavity( m, tol = .Machine$double.eps )
quasiconvexity( m, tol = .Machine$double.eps )
m |
a bordered Hessian matrix or a list containing bordered Hessian matrices |
tol |
tolerance level (values between |
locigal or a logical vector (if m
is a list).
Arne Henningsen
Chiang, A.C. (1984) Fundamental Methods of Mathematical Economics, 3rd ed., McGraw-Hill.
quasiconcavity( matrix( 0, 3, 3 ) )
quasiconvexity( matrix( 0, 3, 3 ) )
m <- list()
m[[1]] <- matrix( c( 0,-1,-1, -1,-2,3, -1,3,5 ), 3, 3 )
m[[2]] <- matrix( c( 0,1,-1, 1,-2,3, -1,3,5 ), 3, 3 )
quasiconcavity( m )
quasiconvexity( m )
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