what is the difference between the importance of a metric and an individual metric? what is normal range for severity? how do you know if a person is severely impaired how do you test impairment in regression tests why are symptoms affected by impairment what is the importance of symptoms in regression how is the variability of impairment compared to an individual what is the importance of symptoms in a linear regression model? how to test the importance of each symptoms how to predict impairment what is impairment based on what is the difference between moderate and severe impairment what is the variance of impairment of a symptom what is the metric of impairment how does impairment vary by symptoms what metric would be used to predict impairment regression model of severity of impairment what is an impairment in regression which metric is used to describe symptoms how does an impairment affect