Add code for calculating setting-specific contact matrices#1

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LloydChapman wants to merge 3 commits intojdmunday:mainfrom

LloydChapman:main

Commits on May 21, 2021

Add code for setting-specific contact matrices
Lloyd Chapman
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Commits on Jul 6, 2021

Add code for fitting zero-inflated negative binomial to school, work and other contacts
LloydChapman
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Commits on Jul 9, 2021

Calculate setting-specific matrices for contact-adjusted immunity analysis
LloydChapman
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