Which Chart Is Right?By Farrokh Alemi Ph.D.
HEALTH INFORMATICS PROGRAM
HI.GMU.EDU
Types of Charts
HEALTH INFORMATICS PROGRAM
GEORGE MASON UNIVERSITY
• XmR
• X-bar
• Tukey
• Time-in-between
• P-chart
HEALTH INFORMATICS PROGRAM
GEORGE MASON UNIVERSITY
• Risk-adjusted XmR
• Risk-adjusted X-bar
• Risk-adjusted Tukey
• Risk-adjusted Time-in-between
• Risk-adjusted P-chart
HEALTH INFORMATICS PROGRAM
GEORGE MASON UNIVERSITY
CONTINUOUS MEASURES
• Length of stay
• Average length of stay
• Average age of a specific
patient population
• Turn around time
• Staff salaries
• Severity of medication
errors
• Individual patient’s
weights
• Individual patient’s blood
sugar
HEALTH INFORMATICS PROGRAM
• Patient satisfaction
average scores
• Infectious waste
poundage generated
• Electrical usage
• Wait times
• Accounts receivable
balances
• Time in restraints
• Time before hanging up
the phone
• SF – 36 scores
GEORGE MASON UNIVERSITY
RATES & DISCRETE MEASURES
• Employee accidents
• Percent of patients with
• Patient falls
insurance
• Nosocomial infection rates • Percent of patients who
• Percent of patients in
rated the facility as
restraints
excellent
• Medication error rate
• Telephone abandonment
• Adverse event rate
rates
• C-Section rates
• Pressure ulcer rates
• Dietary tray errors
• Employee injuries rates
• Delinquent medical records • Percent with appropriate
• Patients who kept their
documentation
resolutions
HEALTH INFORMATICS PROGRAM
GEORGE MASON UNIVERSITY
WHICH CHART IS RIGHT?
If continuous variable
If one data point per time period
If outliers likely: Tukey chart
If outliers not likely: XmR chart
If multiple data points per time period: Xbar chart
If discrete event
If event is rare: Time-in-between chart
If event is not rare: P-chart
HEALTH INFORMATICS PROGRAM
GEORGE MASON UNIVERSITY
WHICH CHART IS RIGHT?
If continuous variable
If one data point per time period
If outliers likely: Tukey chart
If outliers not likely: XmR chart
If multiple data points per time period: Xbar chart
If discrete event
If event is rare: Time-in-between chart
If event is not rare: P-chart
HEALTH INFORMATICS PROGRAM
GEORGE MASON UNIVERSITY
WHICH CHART IS RIGHT?
If continuous variable
If one data point per time period
If outliers likely: Tukey chart
If outliers not likely: XmR chart
If multiple data points per time period: Xbar chart
If discrete event
If event is rare: Time-in-between chart
If event is not rare: P-chart
HEALTH INFORMATICS PROGRAM
GEORGE MASON UNIVERSITY
WHICH CHART IS RIGHT?
If continuous variable
If one data point per time period
If outliers likely: Tukey chart
If outliers not likely: XmR chart
If multiple data points per time period: Xbar chart
If discrete event
If event is rare: Time-in-between chart
If event is not rare: P-chart
HEALTH INFORMATICS PROGRAM
GEORGE MASON UNIVERSITY
WHICH CHART IS RIGHT?
If continuous variable
If one data point per time period
If outliers likely: Tukey chart
If outliers not likely: XmR chart
If multiple data points per time period: Xbar chart
If discrete event
If event is rare: Time-in-between chart
If event is not rare: P-chart
HEALTH INFORMATICS PROGRAM
GEORGE MASON UNIVERSITY
WHICH CHART IS RIGHT?
Case Mix Change
HEALTH INFORMATICS PROGRAM
GEORGE MASON UNIVERSITY
Select the Right Chart
for Your Data
Week 7 Assignment
Please click on the link above to submit this week’s assignment
Please answer question 1, 2, 3, and 4 in the open course site, in the lecture on Comparison of Rates (P-charts). Please show details of your work and not just the final answer.
All calculations inside Excel should use formulas and no value should be hand entered. There are YouTube videos posted on this site to help you. These videos use different
software (Excel, SQL, or Python) in answering the questions. You are encouraged to use whatever software you are familiar with.
Instructions
In order to complete this assignment you must submit a file (usually Excel) with each of the questions answered in a separate sheet. Copy both the question prompts and your
answers to the file. All calculations should be done by formulas and not as fixed values. Each student will upload their file to Blackboard by Sunday, 11:55 PM, ET
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