Merged
Conversation
Implements conditional variance structure to address high uncertainty in spatial interaction curves (SICs) when patients have only one image. Changes: - Preprocessing detects single-image patients and passes flag to Stan - Stan models collapse image-level variance for single-image patients - Multi-image patients retain full 3-level hierarchical structure This resolves identifiability issues where image and patient levels were confounded, reducing unnecessary uncertainty in estimates.
When num_pt_groups == 1, the model cannot estimate between-group variance since there's no replication at the group level. This commit modifies the hierarchy to: - Estimate beta_global as fixed population mean with direct prior - Skip estimation of sigma_beta_global (undefined with one group) - Patients still vary around the group mean via sigma_beta_indiv Changes apply to both centered (SHADE.stan) and non-centered (SHADE_ncp.stan) parameterizations. Three cases now handled: - num_pt_groups > 1: Full hierarchy with between-group variance - num_pt_groups == 1: Fixed group mean, patient variation only - num_pt_groups == 0: Two-level hierarchy (patient + image)
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
No description provided.