Comments (3)
Hi Damien,
Sam is offline for a bit, so I'll try to pinch hit here.
The code for user written ergm terms (like this one) has two pieces, one is the R code you note above, the other is the C code that actually does the calculation, here:
https://github.com/statnet/EpiModelHIV/blob/master/src/changestats.users.c
I'm not a C coder, but this is a pretty simple term. Its primary purpose is to modify the vanilla absdiff term to allow for an "asymmetry" in the age differences by a binary variable like sex: males are typically older than their female partners, and you can take the average difference in age as an "offset" to recenter the age difference to 0 at that value. Net of this offset, the difference in ages then works as before.
As the code shows, when the by variable=1, the contribution to the term is
INPUT_PARAM[t] - INPUT_PARAM[h] - offset
and when =0
INPUT_PARAM[t] - INPUT_PARAM[h] + offset
So, when by=sex, and E(age(M)-age(F)) > 0, M should be coded 1, and F should be coded 0.
LMK if this makes sense.
@sgoodreau pls add comments or corrections as needed :)
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Excellent!
Thanks a lot!
That makes lot of sense and adding this term to my network make the model outputs much more realistic!
Thanks one more time for the kind and fast assistance.
Damien
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Related Issues (20)
- Add unit tests for the simulation workflow in EpiModelHIV
- Clean up of STI initialization submodule HOT 2
- Initial distribution of syphilis by stages moved to initial conditions
- Rename functions to be HIV or STI specific HOT 1
- Don't index on the active attribute
- Hard return of roxygen code
- Standardize order of new.edges matrix in same way as partnership list matrix
- Represent persistent partnership ID in disclosure and partnership matrices HOT 3
- Track number treated for STIs due to intervention HOT 2
- Dual-site (or three-site?) infection to include syphilis HOT 4
- Generate attribute codebook for EpiModelHIV HOT 1
- Change GC to NG in the codebase HOT 5
- VL module rewrite
- New Note - R_registerRoutines and R_useDynamicSymbols HOT 1
- Allow any infection to be initialized at 0
- Over counts based on multiple infections within timesteps
- HIV progress module HOT 1
- Access to .rda files HOT 1
- het-test-script.R error: $ operator is invalid for atomic vectors HOT 1
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