rctglm.md
In postcard: Estimating Marginal Effects with Prognostic Covariate Adjustment

`rctglm` snapshot tests

Code
  estimand(ate_with_cv)
Output
    Estimate Std. Error
  1 1.762089  0.1882041

Code
  estimand(ate_wo_cv)
Output
    Estimate Std. Error
  1 1.762089  0.1846456

Code
  estimand(rr_with_cv)
Output
    Estimate Std. Error
  1 40.80363    8.51032

Code
  estimand(rr_wo_cv)
Output
    Estimate Std. Error
  1 40.80363    8.55476

`estimand_fun_derivX` can be left as NULL or specified manually

Code
  ate_auto <- withr::with_seed(42, {
    rctglm(formula = Y ~ ., exposure_indicator = A, exposure_prob = exposure_prob,
    data = dat_gaus, family = gaussian, estimand_fun = "ate", cv_variance = FALSE,
    verbose = 1)
  })
Message

  -- Symbolic differentiation of estimand function --

  i Symbolically deriving partial derivative of the function 'psi1 - psi0' with respect to 'psi0' as: '-1'.
  * Alternatively, specify the derivative through the argument
  `estimand_fun_deriv0`
  i Symbolically deriving partial derivative of the function 'psi1 - psi0' with respect to 'psi1' as: '1'.
  * Alternatively, specify the derivative through the argument
  `estimand_fun_deriv1`