How to use have GoldSim "repeat" a selected historical year?

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Page Weil

• August 18, 2026 22:24

I have output from a third party model (that model is run on a daily basis from 1950-2015) that is part of the input for a GoldSim model.

My GoldSim model is intended to represent future conditions (2027-2050) that account for the 3rd party data and other sources as well. In each realization of my GoldSim model, I want to pick a specific historical year from my 3rd party model dataset, and use that data in each year of the GoldSim simulation (eg, I want to use the daily data from 2002 as the daily data for every year from 2027-2050).

Time shifting allows me to select the year that the time shift starts (2027 is represented by 2002 3rd party model data) but then future years continue to shift forward (2028 is represented by 2003 3rd party model data).

How do I force GoldSim to reuse the same year over and over during the realization? 

Thanks!

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• Official comment

  

  Rick Kossik

  • August 18, 2026 22:46

  GoldSim has no way to take a long time history and just replay one year over and over again (I am a little puzzled as to why you would want to do that).  However, there is a way to force this.  You would need to put each historical year in as a different 1 year series (basically put in multiple 1 year histories: https://help.goldsim.com/default.htm#GS/definingmultipletimeseriesinasingletimeserieselement.htm). You would still use time shifting, but there would only be one year, so it would repeat the same year over and over again (by looping back). You could then just modify one parameter to choose what history to use.  However, this might take a little massaging to get it to work properly (due to leap years).  Send a regular ticket and we can chat...

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