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