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        | Geographic information system |  
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        | was the first to use vital statistics table |  
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        | A mathematical modeling technique that allows one to analyze prospectively collected data |  
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        Definition 
        
        | Defined as the resistance of a group to an attack by a disease to which a large proportion of the members of the group are immune. |  
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        Definition 
        
        | Father of medical statistics |  
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        Definition 
        
        | See retrospective cohort study |  
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        Term 
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        Definition 
        
        | A group from the past which is being used as a comparison group |  
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        Definition 
        
        | Constant or uniform measures or variances across strata |  
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        Definition 
        
        | Denotes transmission from one person to anotherm directly or indirectly |  
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        Definition 
        
        | A person or other living animal that affords sunsistence or lodgment to an infectious agent under natural conditions. |  
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        Definition 
        
        | A study design which is a combination of more than one standard study design |  
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