Health Care
Health Care
Creatin" rel="nofollow">ing a Monte Carlo simulation (Win" rel="nofollow">indows operatin" rel="nofollow">ing system needed).
Go to the followin" rel="nofollow">ing lin" rel="nofollow">ink: http://www.palisade.com/cgi-bin" rel="nofollow">in/trialversion_in" rel="nofollow">info.pl?product=1000-I-6000-EN&FormRegion=US, to download the software @Risk. You just need the free trial version to
complete this task. You will need to in" rel="nofollow">install the software on your computer. Start the program and an Excel file will open automatically.
Here is the lin" rel="nofollow">ink to the quick start guide: http://www.palisade.com/QuickStart/EN/RISK/ (Lin" rel="nofollow">inks to an external site.)
I have downloaded an excel file detailin" rel="nofollow">ing an example of a Monte Carlo Simulation. The file title is "F2".
Construct a Monte Carlo simulation model to answer the followin" rel="nofollow">ings:
VVH is considerin" rel="nofollow">ing a pharmacy-managed medication assistance program (MAP). This program would help patients who are unable to afford pharmaceuticals obtain" rel="nofollow">in free drugs from pharmaceutical
manufacturers. VVH would save the cost of the drugs but in" rel="nofollow">incur costs to manage the program. They would like to know whether the program would be cost beneficial. VVH believes that between 60 and 120
patients will use this program with equal probability over this range (a uniform distribution). The average value of a patient’s drugs per year most likely will be $200 but could be as low as $0 or
as high as $1,000 (a triangular distribution). They believe that the time to admin" rel="nofollow">inister the program will follow a normal distribution with a mean of 4 hours/week and a standard deviation of 0.5
hours/week (but never less than 0 hours). VVH also believes that there is an 80 percent probability that pharmacy research fellows who receive wages and benefits of $30/hour could admin" rel="nofollow">inister the
program, but hospital pharmacists may need to admin" rel="nofollow">inister the program ($60/hour wages and benefits). Analyze this situation usin" rel="nofollow">ing @Risk. What should VVH do? Why?
Several in" rel="nofollow">input variables should be in" rel="nofollow">included in" rel="nofollow">in the model:
Patient Utilization: a uniform distribution
Drug Value: a triangular distribution
Admin" rel="nofollow">inistration Time: a normal distribution. Note that the min" rel="nofollow">inimum value for time is 0. First highlight the cell that will contain" rel="nofollow">in the value of admin" rel="nofollow">in time, click Defin" rel="nofollow">ine Distributions, select Normal.
Then you will see a dialogue box. You will see Function (Normal), Parameters (standard), etc. on the left hand side. Click the cell contain" rel="nofollow">inin" rel="nofollow">ing Standard and you will see a small black triangle.
Click the triangle and another dialogue box will jump out. Check Truncation Limits and click OK. Now you will be able to set the Trunc. Min" rel="nofollow">in to 0. To get the admin" rel="nofollow">inistrative time for a year, you need
to multiply this value by 50 (assume the program operates 50 weeks a year).
Admin" rel="nofollow">inistration Cost: select discrete distribution for the value of this variable. The value can be $30 per hour with an 80% chance and $60 per hour with a 20% chance. To specify the probability
distribution for this variable, first highlight the cell that is used to store the value for this variable. Click Defin" rel="nofollow">ine Distributions tab from the @Risk ribbon. Double click Discrete to select
discrete distribution. In the dialogue box that jumped out, click the cell right to X-Table and you can see a small black triangle. Click the triangle and you will see a table editor. Change the
numbers for the X-Table and P-Table columns. The X-Table column holds values ($30 and $60) and the P-Table contain" rel="nofollow">ins correspondin" rel="nofollow">ing probabilities.
The output variable Net Benefit equals Patient Utilization* Drug Value - Admin" rel="nofollow">inistration Time*50* Admin" rel="nofollow">inistration Cost.
After you specify the values, you should see =risk* in" rel="nofollow">in the formula bar when you highlight a cell. The value for the output variable should contain" rel="nofollow">in =RiskOutput()+Patient Utilization* Drug Value -
Admin" rel="nofollow">inistration Time*50* Admin" rel="nofollow">inistration Cost.
Specify Iterations as 100 and Simulations as 1 in" rel="nofollow">in the Simulation tool group in" rel="nofollow">in the @Risk tab. Click Start Simulation to run the simulation model. A dialogue box will jump out to display the
distribution of the output variable. You can see a confidence limit on the top of the graph. Click on the lower limit and change the value to 0. In this way, you can know the probability for the
hospital to lose money in" rel="nofollow">in this program. Mouse over the third icon at the bottom of the dialogue box and it reads Edit and Export. Click it and select Chart in" rel="nofollow">in Excel. Insert a Text Box in" rel="nofollow">in the Excel
file to answer the questions: should the hospital adopt the program and why?