what is the model type of the exposure variable how to combine exposure variables in r what is the function for exposure variable in r what are exposure variables that can be combined how to compare different exposure variables in r how to combine exposure variables why add exposure variables in a model what is avg in statistics what is the function of polymerase chain reaction what is the use of different exposure variables what is the model type for calculating an exposure variable in a count data model? how to combine variables in r what type of model for combining different exposure variables if the exposure is a group and the group is in an inverse model what is the model averaging? when using a range of exposure variables, what is the best way to find the relationship of the models that are used in the present experiment? how to analyze different exposure variables in r how to combine two exposure variables in r what model can use to combine three variables what is the model type for exposure variables which approach best describes a model of the resulting count data?