MplusAutomation (version 0.6-1)

testBParamConstraint: Test inequality-constrained hypothesis for two parameters based on iterations of MCMC chains

Description

Tests a simple inequality-constrained hypothesis (van de Schoot, Hoijtink, Hallquist, & Boelen, in press) based on draws from the posterior distribution of the model parameters, which provides information about the proportion of the distribution that is in agreement with a given hypothesis. This function is used for simple hypothesis for two parameters, whereas testBParamCompoundConstraint gives full access to multiple parameters and R's logic syntax. This function accepts a bparameters object containing iterations of the MCMC chains (rows) for each model parameter (columns) and prints out the number and proportion of draws that are consistent with the requested hypothesis test. The coef1, operator, and coef2 arguments are appended in sequence, so that the hypothesis test is constructed from left-to-right. e.g., testBParamConstraint(bparamsDF, "MGM.TRT1", ">", "MGM.EX2").

Usage

testBParamConstraint(bparams, coef1, operator, coef2)

Arguments

bparams

An object containing draws from the posterior distribution (class mplus.model or mplus.bparameters). Obtained by SAVEDATA:BPARAMETERS in Mplus and getSavedata_Bparams

coef1

The name of the first parameter to be compared. Example: "MGM.TRT1"

operator

A logical operator to compare the two parameters. Should be one of >=, >, <, or="" <=". Example: ">="

coef2

The name of the first parameter to be compared. Example: "MGM.EX2"

Value

• No value is returned by this function. Instead, two summary tables are printed to the screen containing the number and proportion of draws consistent with the hypothesis.

See Also

testBParamCompoundConstraint

Examples

#using bparameters directly
  btest <- getSavedata_Bparams("model vb1_simpel_b.out"))
  testBParametersConstraint(btest, "STDYX_STAITOT.ON.CG", ">", "STDYX_STAITOT.ON.UCG")

  #or using readModels
  btest <- readModels("model vb1_simpel_b.out"))
  testBParametersConstraint(btest, "STDYX_STAITOT.ON.CG", ">", "STDYX_STAITOT.ON.UCG")