A key hospital outcome measure of clinical performance is length of stay (LOS); that is, the number of days a patient is hospitalized. For patients at one hospital with acute myocardial infarction (heart attack), the length of stay over the past four years has consistently decreased. The hospital also has data for various treatment options such as the percentage of patients who received aspirin upon arrival and cardiac medication for Left Ventricular Systolic Dysfunction (LVSD). The data are shown below:

Illustrate the interlinking relationships by constructing scatter using Excel showing the LOS as a function of the other variables. What do these models tell you?

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Year Average LOS Aspirin on arrival LVSD medication 2007 4.55 days 2008 4.33 days 2009 4.12 days 2010 4.02 days 9590 9890 9990 100% 89% 93% 9690 9890