r - Unable to get confidence intervals using broom for a gamlss model with a sigma.formula term -


i fitting gamlss model call:

model <- gamlss(formula = formula("y_variable ~ image_name + random(biological_source_name) - 1"),        sigma.formula = formula("~ biological_source_name - 1"),        family = "nbi",        data = na.omit(data))

however error when trying confidence intervals using broom::confint_tidy:

confint_tidy(model)

the message is:

 error in usemethod("family") :    no applicable method 'family' applied object of class "null" in addition: warning message: in vcov.gamlss(object, robust = robust) :   additive terms exists in  mu formula.    standard errors linear terms maybe not appropriate

however different error when trying use broom::tidy:

broom::tidy(model)

the message is:

 error in data.frame(..., check.names = false) :    arguments imply differing number of rows: 0, 73

when fit model without sigma.formula term, able confidence intervals.

model_no_sigma <- gamlss(formula = formula("y_variable ~ image_name + random(biological_source_name) - 1"),        family = "nbi",        data = na.omit(data)) broom::tidy(model_no_sigma) # produce ci output

reproducible example

    library("gamlss")  example_data <- rbind(   data.frame(     y = rnbinom(200, mu = 10, size = 1),     x = "var_1"   ),   data.frame(     y = rnbinom(200, mu = 20, size = 10),     x = "var_2"   ) )  # no estimate sigma model_1 <- gamlss(formula = formula("y ~ x - 1"),                 data = example_data,                 family = "nbi") broom::tidy(model_1, conf.int = true)   # include intercept term sigma model_2 <- gamlss(formula = formula("y ~ x - 1"),                   sigma.formula = formula("~ x"),                 data = example_data,                 family = "nbi") broom::tidy(model_2, conf.int = true)   # remove intercept sigma model_3 <- gamlss(formula = formula("y ~ x - 1"),                   sigma.formula = formula("~ x - 1"),                 data = example_data,                 family = "nbi") broom::tidy(model_3, conf.int = true)

example output

screen shot of error output


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