Are there any examples of how to create a measurement model for the dependent variable?
Specifically, I’m measuring a latent variable using, say, 10 Likert items. These are supposed to be predicted in a multilevel model. I know I can add noise to the relationship, but how I can I e.g. turn the latent variable into a Likert item?

Is something like this the intended way? It seems to work, but it seems to mix two steps.

declare_estimator(
draw_likert(Y) ~ midcycle,
estimand = estimands_regression,
model = lm,
term = TRUE
)

Edit: Sorry, just saw the response to my other question. Ok, I can declare everything in declare_population, but then I sort of lose out on many of the benefits of DeclareDesign, don’t I? That’s what I was doing before.
At least, it seems everything gets more jumbled.

Old

But I’ve specified Y in declare_potential_outcomes. declare_population comes after, right?

Here is a fixed design with some comments re the above

design <-
# simulate data
declare_population(
obs = add_level(N = 100,
noise = rnorm(N)
)
) +
# simulate real relationship
declare_potential_outcomes(Y ~ draw_ordered(0.5 * midcycle + noise, breaks = -3:3), assignment_variables = "midcycle") +
estimands_regression +
declare_assignment(prob=.2, assignment_variable = "midcycle") +
# simulate how we estimate relationship
# Technically this can be create automatically
#declare_reveal(outcome_variables = "Y", assignment_variables = c("midcycle")) +
declare_estimator(
Y ~ midcycle,
estimand = estimands_regression,
model = lm,
term = TRUE
)

In your design, where PO and assn were both using the default Z assignment variable, (and Z was unused in the PO formula), those two steps were merely creating unused variables Y_Z_1, Y_Z_0 and Z - they weren’t doing anything helpful anyway.

In my edits, I moved midcycle to the assnment step, and it seems like things work; also added the draw_ordered to the PO step (draw_likert didn’t work for me bc it created text?) which seems like a more natural place for it. I also set the assn variable on the two steps explicitly to midcycle.