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 as follows: Year Average LOS Aspirin on arrival LVSD medication 2007 4.31 days 94% 89% 2008 4.10 days 96% 94% 2009 4.35 days 98% 97% 2010 4.13 days 100% 98% Calculate descriptive statistics for the data. Do not round intermediate calculations. Round your answers to four decimal places, when needed. Descriptive Statistics: LOS, Aspirin, LVSD Standard Standard Variable Mean Error Deviation Minimum Median Maximum LOS (days) Aspirin (%) LVSD (%) Calculate correlations for the data. Do not round intermediate calculations. Use a minus sign for negative values, if any. Round your answers to three decimal places. Correlations: LOS, Aspirin, LVSD LOS Aspirin Aspirin LVSD

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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 as follows:

Year	Average LOS	Aspirin on arrival	LVSD medication
2007	4.31 days	94%		89%
2008	4.10 days	96%		94%
2009	4.35 days	98%		97%
2010	4.13 days	100%		98%

Calculate descriptive statistics for the data. Do not round intermediate calculations. Round your answers to four decimal places, when needed.

Descriptive Statistics: LOS, Aspirin, LVSD
		Standard	Standard
Variable	Mean	Error	Deviation	Minimum	Median	Maximum
LOS (days)
Aspirin (%)
LVSD (%)

Calculate correlations for the data. Do not round intermediate calculations. Use a minus sign for negative values, if any. Round your answers to three decimal places.

Correlations: LOS, Aspirin, LVSD
	LOS	Aspirin
Aspirin
LVSD

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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