Plot method for the crs function
# S3 method for crs plot(x, ...)
| x | Return value from   | 
    
|---|---|
| ... | further arguments passed to or from other methods  | 
    
Plot that compares actual to predicted ratings. See https://radiant-rstats.github.io/docs/model/crs.html for an example in Radiant
crs to generate results
summary.crs to summarize results