![]() vcovHAC: Heteroscedasticity and Autocorrelation Consistent (HAC).GEM Premier 3500 system with iQM, GEM Premier ChemSTAT system, GEMweb Plus. Solomon Islands, Somalia, South Africa, South Georgia and the South Sandwich Islands, South Korea, South Sudan, Spain, Sri Lanka, St Pierre and Miquelon. Travelers may also take the rapid antibody test for 50 if desired. vcovCL: Clustered Covariance Matrix Estimation These include Hemostasis and Acute Care Diagnostics, in Bedford, MA, USA. The saliva-based PCR test is 125 and the rapid antigen test is 100.vcovBS: (Clustered) Bootstrap Covariance Matrix Estimation.sandwich: Making Sandwiches with Bread and Meat. ![]() Please also note that availability will vary depending on your request.
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