View source: R/FMPMonotonicityCheck.R
FMPMonotonicityCheck  R Documentation 
Utility function for checking whether candidate FMP coefficients yield a monotonically increasing polynomial.
FMPMonotonicityCheck(b, lower = 20, upper = 20, PLOT = FALSE)
b 
A vector of 8 polynomial coefficients ( 
lower, upper 

PLOT 
Logical (default = FALSE). If PLOT = TRUE the function will
plot the original polynomial function for 
increasing 
Logical indicating whether function is monotonically increasing. 
minDeriv 
Minimum value of the derivative for the polynomial. 
minTheta 
Value of 
Niels Waller
## A set of candidate coefficients for an FMP model.
## These coefficients fail the test and thus
## should not be used with genFMPdata to generate
## item response data that are consistent with an
## FMP model.
b < c(1.21, 1.87, 1.02, 0.18, 0.18, 0, 0, 0)
FMPMonotonicityCheck(b)
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