When Will You Need This?
When you need to estimate the length of stay remaining, for entities that are preloaded.
The following model object can be found in the model objects directory: Time \ Remaining Length of Stay Estimator.
Ease of Use: Moderate
Ease of Modification: Moderate
How to Use the Model Object
1. Open Your Model
Open your model or create a new blank model.
2. Insert the Model Object into Your Model
1. Locate the model object Remaining Length of Stay Estimator and select the insert button.
2. Move the cursor to the point of insertion and left mouse-click. The upper left corner of the model object will be inserted at the location of the mouse-click.
3. Update Objects
1. Copy the logic from the action logic of the Ward 1.
2. Use this logic to replace the term a_Next_Time in the action logic of the “ward” in your model.
2.1. For each “ward” a new variable needs to be added, v_LocTime2, v_LocTime3, etc.
2.2. Replace the v_LocTime1, in the ward, with the newly created variable.
At the start of the model: 1. How many entities will be in a “ward” are of the hospital? 2. How much remaining LOS with a patient have. Both of the items above are needed to accurately predict the behavior of the system.
4. Review Model
1. Run the model for an extended period. Several years so that a sufficient sample is collected.
2. From the output report, export the variable data for v_LocTime# to Excel, and then open the Excel file from the location it was saved in.
3. Remove the first 2 months of data (Use the appropriate time for your the ward).
4. Analyze the Excel export to determine the “census” and “remaining LOS”
5. Use Stat::Fit to create a distribution for be beginning census and remaining LOS.
5.1. Copy the “values” left in the Excel file.
5.2. Goto ProcessModel, open Stat::Fit (Tools \ Stat::Fit) and paste the copied data.
5.3. Click Autofit and then click OK on the new window.
5.4. Click Export and then click OK to export the distribution to Windows clipboard.
6. Create a one time arrival (Periodic) into each ward using the distribution defining the beginning census as the “Quantity per Arrival.”
7. Set the attribute a_Next_Time = the distribution “Remaining LOS” (In the action logic of the arrival).
8. Remove pasted Estimator Model Object from your model.
This model object will not be part of your final model. It is designed to be inserted into a model temporarily to help discover the remaining length of stay and then be removed. The data collected from this MO will help to identify the distribution used as a remaining LOS for entities pre loaded to start the simulation.
The model object is now integrated into your model, you should now be able to save and then simulate the model.
Attributes, Variables, Scenario Parameters and Scenarios Usage
1. a_Next_Time: Do not change. Is the attribute used to store time values for the for entities. Initial value must be provided when entities are preloaded.
2. a_HoursRW: Do not change. Is used to store the hours remaining in the week. Nothing needs to be changed for the attribute.
1. v_LocTime1: Do not change. Is used to store the remaining time value for the entities each weekend. A new variable will need to be defined for each “Ward” for which remaining LOS will be collected.
2. v_HoursRW: Do not change. Is used to calculate the hours remaining in the week. Nothing needs to be changed for the variable.