Helper: function to run a binary analysis using glm
     
    
    Usage
    glm_analysis(data, outcome, exposure, covariates = NULL, weight_var = NULL)
 
    
    Arguments
- data
- data frame 
- outcome
- name of outcome variable 
- exposure
- name of exposure variable 
- covariates
- vector of covariate names 
- weight_var
- name of weight variable 
 
    
    Value
    list of results from model for the exposure