tests/testthat/test_composites_da.R

In modsem: Latent Interaction (and Moderation) Analysis in Structural Equation Models (SEM)

devtools::load_all()

tpb.lin <- '
# Outer Model (Based on Hagger et al., 2007)
  ATT <~ att1 + att2 + att3 + att4 + att5
  SN =~ sn1 + sn2
  PBC =~ pbc1 + pbc2 + pbc3
  INT =~ int1 + int2 + int3
  BEH <~ b1 + b2

# Inner Model (Based on Steinmetz et al., 2011)
  INT ~ ATT + SN + PBC
  BEH ~ INT + PBC
'

testthat::expect_no_condition({
  fit_lav <- lavaan::sem(tpb.lin, TPB, optim.gradient = "numerical")
  fit_mod <- modsem(tpb.lin, TPB, method = "lms")
  head(modsem_predict(fit_mod))
  head(modsem_predict(fit_mod, newdata = TPB[1:100, ]))
})

testthat::expect_true(fit_mod$iterations == 2L)
coef_lav <- lavaan::coef(fit_lav)
coef_mod <- coef(fit_mod)[names(coef_lav)]

msr_lav <- lavaan::fitMeasures(fit_lav)
msr_mod <- fit_modsem_da(fit_mod)

testthat::expect_equal(c(coef_lav), c(coef_mod), tol = 1e-3)
testthat::expect_equal(msr_lav[["chisq"]], msr_mod[["chisq.value"]], tol = 1e-3)
testthat::expect_equal( # modsem does not fix composite variances like lavaan
  msr_mod[["chisq.df"]] + msr_mod[["npar"]] - msr_lav[["npar"]] - 15, # -15 for mean structure
  msr_lav[["df"]]
)

# Test standardization of indicator covariances
std <- standardized_estimates(fit_mod)
att <- c("att1", "att2", "att3", "att4", "att5")
S <- cor(TPB[att])

for (i in seq_along(att)) {
  x <- att[[i]]

  for (j in seq_len(i)) {
    y <- att[[j]]

    observed <- S[x, y]
    expected <- std[
      (std$lhs == x & std$op == "~~" & std$rhs == y) |
      (std$lhs == y & std$op == "~~" & std$rhs == x), "est"
    ]

    testthat::expect_equal(observed, expected)
  }
}


tpb.int <- '
# Outer Model (Based on Hagger et al., 2007)
  ATT <~ att1 + att2 + att3 + att4 + att5
  SN =~ sn1 + sn2
  PBC =~ pbc1 + pbc2 + pbc3
  INT =~ int1 + int2 + int3
  BEH <~ b1 + b2

# Inner Model (Based on Steinmetz et al., 2011)
  INT ~ ATT + SN + PBC
  BEH ~ INT + PBC + INT:PBC
'

testthat::expect_no_condition(
  modsem(tpb.int, TPB, method = "lms", nodes = 32)
)

testthat::expect_error(
  modsem(tpb.int, TPB, method = "qml"),
  regexp = "Composite constructs .*"
)

testthat::expect_true(!is.null(modsem_inspect(fit_mod)$wmat))