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Meridian supports national-level models, although we recommend that you
use the geo-level model when possible. The national-level model is a special
case of the geo-level model with only a single geo. There is no separate model
class.
The following parameter restrictions apply, and are automatically enforced, when
you use the national-level model:
\(\eta^{[M]}_i=0\) and \(\beta_{1,i}^{[M]}=\beta_i^{[M]} \ \ \forall i\)
\(\eta^{[OM]}_i=0\) and \(\beta_{1,i}^{[OM]}=\beta_i^{[OM]} \ \ \forall i\)
\(\eta^{[RF]}_i=0 \) and \(\beta^{[RF]}_{g,i}=\beta^{[RF]}_i
\ \ \forall i\)
\(\eta^{[ORF]}_i=0 \) and \(\beta^{[ORF]}_{g,i}=\beta^{[ORF]}_i
\ \ \forall i\)
\(\xi_i^{[C]}=0\) and \(\gamma_{1,i}^{[C]}=\gamma_i^{[C]} \ \ \forall c\)
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-12 UTC."],[],[],null,["# National-level modeling\n\nMeridian supports national-level models, although we recommend that you\nuse the geo-level model when possible. The national-level model is a special\ncase of the geo-level model with only a single geo. There is no separate model\nclass.\n\nThe following parameter restrictions apply, and are automatically enforced, when\nyou use the national-level model:\n\n- \\\\(\\\\eta\\^{\\[M\\]}_i=0\\\\) and \\\\(\\\\beta_{1,i}\\^{\\[M\\]}=\\\\beta_i\\^{\\[M\\]} \\\\ \\\\ \\\\forall i\\\\)\n- \\\\(\\\\eta\\^{\\[OM\\]}_i=0\\\\) and \\\\(\\\\beta_{1,i}\\^{\\[OM\\]}=\\\\beta_i\\^{\\[OM\\]} \\\\ \\\\ \\\\forall i\\\\)\n- \\\\(\\\\eta\\^{\\[RF\\]}_i=0 \\\\) and \\\\(\\\\beta\\^{\\[RF\\]}_{g,i}=\\\\beta\\^{\\[RF\\]}_i \\\\ \\\\ \\\\forall i\\\\)\n- \\\\(\\\\eta\\^{\\[ORF\\]}_i=0 \\\\) and \\\\(\\\\beta\\^{\\[ORF\\]}_{g,i}=\\\\beta\\^{\\[ORF\\]}_i \\\\ \\\\ \\\\forall i\\\\)\n- \\\\(\\\\xi_i\\^{\\[C\\]}=0\\\\) and \\\\(\\\\gamma_{1,i}\\^{\\[C\\]}=\\\\gamma_i\\^{\\[C\\]} \\\\ \\\\ \\\\forall c\\\\)\n- `unique_sigma_for_each_geo = False`\n\n| **Note:** Population scaling has no effect in the national-level model."]]
