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context("saemix parent models")
test_that("Parent fits using saemix are correctly implemented", {
skip_on_cran()
expect_error(saem(fits), "Only row objects")
# SFO
# mmkin_sfo_1 was generated in the setup script
# We did not introduce variance of parent_0 in the data generation
# This is correctly detected
expect_equal(as.character(illparms(sfo_saem_1)), "sd(parent_0)")
# So we have also done a fit without this variance
expect_equal(as.character(illparms(sfo_saem_1_reduced)), character(0))
expect_silent(print(illparms(sfo_saem_1_reduced)))
# We cannot currently do the fit with completely fixed initial values
mmkin_sfo_2 <- update(mmkin_sfo_1, fixed_initials = c(parent = 100))
sfo_saem_3 <- expect_error(saem(mmkin_sfo_2, quiet = TRUE), "at least two parameters")
# We get an error if we do not supply a suitable model specification
expect_error(update(mmkin_sfo_1, models = c("SFOOO")), "Please supply models.*")
sfo_saem_1_mkin <- saem(mmkin_sfo_1, quiet = TRUE, transformations = "mkin")
expect_equal(as.character(illparms(sfo_saem_1_mkin)), "sd(parent_0)")
sfo_saem_1_reduced_mkin <- update(sfo_saem_1_mkin, no_random_effect = "parent_0")
# The endpoints obtained do not depend on the transformation
expect_equal(endpoints(sfo_saem_1), endpoints(sfo_saem_1_mkin), tol = 0.01)
expect_equal(endpoints(sfo_saem_1_reduced), endpoints(sfo_saem_1_reduced_mkin), tol = 0.01)
s_sfo_saem_1 <- summary(sfo_saem_1)
s_sfo_saem_1_reduced <- summary(sfo_saem_1_reduced)
s_sfo_saem_1_mkin <- summary(sfo_saem_1_mkin)
s_sfo_saem_1_reduced_mkin <- summary(sfo_saem_1_reduced_mkin)
sfo_nlme_1 <- expect_warning(nlme(mmkin_sfo_1), "not converge")
s_sfo_nlme_1 <- summary(sfo_nlme_1)
# Compare with input
expect_equal(round(s_sfo_saem_1$confint_ranef["SD.k_parent", "est."], 1), 0.3)
expect_equal(round(s_sfo_saem_1_mkin$confint_ranef["SD.log_k_parent", "est."], 1), 0.3)
# k_parent is a bit different from input 0.03 here
expect_equal(round(s_sfo_saem_1$confint_back["k_parent", "est."], 3), 0.035)
expect_equal(round(s_sfo_saem_1_mkin$confint_back["k_parent", "est."], 3), 0.035)
# But the result is pretty unanimous between methods
expect_equal(round(s_sfo_saem_1_reduced$confint_back["k_parent", "est."], 3),
round(s_sfo_saem_1$confint_back["k_parent", "est."], 3))
expect_equal(round(s_sfo_saem_1_mkin$confint_back["k_parent", "est."], 3),
round(s_sfo_saem_1$confint_back["k_parent", "est."], 3))
expect_equal(round(s_sfo_saem_1_reduced_mkin$confint_back["k_parent", "est."], 3),
round(s_sfo_saem_1$confint_back["k_parent", "est."], 3))
expect_equal(round(s_sfo_nlme_1$confint_back["k_parent", "est."], 3),
round(s_sfo_saem_1$confint_back["k_parent", "est."], 3))
# Compare fits with heavy rounding to avoid platform dependent results
anova_sfo <- anova(
sfo_saem_1, sfo_saem_1_reduced,
sfo_saem_1_mkin, sfo_saem_1_reduced_mkin,
test = TRUE)
anova_sfo_rounded <- round(anova_sfo, 0)
expect_known_output(print(anova_sfo_rounded), file = "anova_sfo_saem.txt")
# Check the influence of an invented covariate
set.seed(123456) # In my first attempt I hit a false positive by chance...
pH <- data.frame(pH = runif(15, 5, 8), row.names = as.character(1:15))
sfo_saem_pH <- update(sfo_saem_1_reduced_mkin, covariates = pH,
covariate_models = list(log_k_parent ~ pH))
# We expect that this is not significantly better, as the covariate values were completely random
expect_true(anova(sfo_saem_1_reduced_mkin, sfo_saem_pH, test = TRUE)[2, "Pr(>Chisq)"] > 0.05)
# FOMC
mmkin_fomc_1 <- mmkin("FOMC", ds_fomc, quiet = TRUE, error_model = "tc", cores = n_cores)
fomc_saem_1 <- saem(mmkin_fomc_1, quiet = TRUE, transformations = "saemix", no_random_effect = "parent_0")
fomc_saem_2 <- update(fomc_saem_1, transformations = "mkin")
ci_fomc_s1 <- summary(fomc_saem_1)$confint_back
fomc_pop <- as.numeric(fomc_pop)
expect_true(all(ci_fomc_s1[, "lower"] < fomc_pop))
expect_true(all(ci_fomc_s1[, "upper"] > fomc_pop))
expect_equal(endpoints(fomc_saem_1), endpoints(fomc_saem_2), tol = 0.01)
mmkin_fomc_2 <- update(mmkin_fomc_1, state.ini = 100, fixed_initials = "parent")
fomc_saem_2 <- saem(mmkin_fomc_2, quiet = TRUE, transformations = "mkin")
ci_fomc_s2 <- summary(fomc_saem_2)$confint_back
expect_true(all(ci_fomc_s2[, "lower"] < fomc_pop[2:3]))
expect_true(all(ci_fomc_s2[, "upper"] > fomc_pop[2:3]))
# DFOP
dfop_saemix_2 <- saem(mmkin_dfop_1, quiet = TRUE, transformations = "saemix",
no_random_effect = "parent_0")
s_dfop_s1 <- summary(dfop_saemix_1)
s_dfop_s2 <- summary(dfop_saemix_2)
s_dfop_n <- summary(dfop_nlme_1)
dfop_pop <- as.numeric(dfop_pop)
# When using DFOP with mkin transformations, k1 and k2 are sometimes swapped
swap_k1_k2 <- function(p) c(p[1], p[3], p[2], 1 - p[4])
expect_true(all(s_dfop_s1$confint_back[, "lower"] < swap_k1_k2(dfop_pop)))
expect_true(all(s_dfop_s1$confint_back[, "upper"] > swap_k1_k2(dfop_pop)))
expect_true(all(s_dfop_s2$confint_back[, "lower"] < dfop_pop))
expect_true(all(s_dfop_s2$confint_back[, "upper"] > dfop_pop))
# We get < 20% deviations with transformations made in mkin (need to swap k1 and k2)
rel_diff_1 <- (swap_k1_k2(s_dfop_s1$confint_back[, "est."]) - dfop_pop) / dfop_pop
expect_true(all(rel_diff_1 < 0.20))
# We get < 20% deviations with transformations made in saemix
rel_diff_2 <- (s_dfop_s2$confint_back[, "est."] - dfop_pop) / dfop_pop
expect_true(all(rel_diff_2 < 0.2))
# SFORB
mmkin_sforb_1 <- mmkin("SFORB", ds_dfop, quiet = TRUE, cores = n_cores)
sforb_saemix_1 <- saem(mmkin_sforb_1, quiet = TRUE,
no_random_effect = c("parent_free_0"),
transformations = "mkin")
sforb_saemix_2 <- saem(mmkin_sforb_1, quiet = TRUE,
no_random_effect = c("parent_free_0"),
transformations = "saemix")
expect_equal(
log(endpoints(dfop_saemix_1)$distimes[1:2]),
log(endpoints(sforb_saemix_1)$distimes[1:2]), tolerance = 0.03)
expect_equal(
log(endpoints(sforb_saemix_1)$distimes[1:2]),
log(endpoints(sforb_saemix_2)$distimes[1:2]), tolerance = 0.01)
mmkin_hs_1 <- mmkin("HS", ds_hs, quiet = TRUE, error_model = "const", cores = n_cores)
hs_saem_1 <- saem(mmkin_hs_1, quiet = TRUE)
hs_saem_2 <- saem(mmkin_hs_1, quiet = TRUE, transformations = "mkin")
expect_equal(endpoints(hs_saem_1), endpoints(hs_saem_2), tol = 0.01)
ci_hs_s1 <- summary(hs_saem_1)$confint_back
hs_pop <- as.numeric(hs_pop)
#expect_true(all(ci_hs_s1[, "lower"] < hs_pop)) # k1 is overestimated
expect_true(all(ci_hs_s1[, "upper"] > hs_pop))
mmkin_hs_2 <- update(mmkin_hs_1, state.ini = 100, fixed_initials = "parent")
hs_saem_3 <- saem(mmkin_hs_2, quiet = TRUE)
ci_hs_s3 <- summary(hs_saem_3)$confint_back
#expect_true(all(ci_hs_s3[, "lower"] < hs_pop[2:4])) # k1 again overestimated
expect_true(all(ci_hs_s3[, "upper"] > hs_pop[2:4]))
})
test_that("We can also use mkin solution methods for saem", {
expect_error(saem(mmkin_dfop_1, quiet = TRUE, transformations = "saemix", solution_type = "analytical"),
"saemix transformations is only supported if an analytical solution is implemented"
)
skip("This still takes almost 2.5 minutes although we do not solve ODEs")
dfop_saemix_3 <- saem(mmkin_dfop_1, quiet = TRUE, transformations = "mkin",
solution_type = "analytical", no_random_effect = "parent_0")
distimes_dfop <- endpoints(dfop_saemix_1)$distimes
distimes_dfop_analytical <- endpoints(dfop_saemix_3)$distimes
rel_diff <- abs(distimes_dfop_analytical - distimes_dfop) / distimes_dfop
expect_true(all(rel_diff < 0.01))
})
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