data.table with date index, model fit, and lower and upper intervals.
1  | lm.fitconf(lm.object, date.index = "Week", conf.level = 0.95)
 | 
lm.object | 
 Output of lm function.  | 
date.index | 
 Character. The column from the model source data that is the date variable.  | 
conf.level | 
 Confidence level, default = 95%.  | 
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