https://github.com/mrustl/user-2016

Video & slides for the "Wrap your model in an R package" talk @ useR2016
https://github.com/mrustl/user-2016

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Video & slides for the "Wrap your model in an R package" talk @ useR2016

• Host: GitHub
• URL: https://github.com/mrustl/user-2016
• Owner: mrustl
• Created: 2016-06-16T14:15:48.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2019-02-28T08:21:58.000Z (almost 6 years ago)
• Last Synced: 2024-11-07T01:41:49.724Z (about 2 months ago)
• Homepage:
• Size: 1.73 MB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# useR-2016

[![Video](video.jpg)](https://channel9.msdn.com/Events/useR-international-R-User-conference/useR2016/Wrap-your-model-in-an-R-package/player)

[Slides](https://github.com/mrustl/useR-2016/blob/master/WrapYourModel.pdf) for the "Wrap your model in an R package" talk @ useR2016

# Challenges

Environmental models are: 

- (Usually) not implemented in R 

- Generic: i.e. the model parameterisations need to be defined for each case-study (**at least one model run**),

possibly followed by a sensitivity analysis (**multiple model runs**) to identify the model parameters with the 

highest impact on the model predictions. Finally a model calibration step (**multiple model runs**) for minimising

the error between measured and predicted model output is performed by varying the most sensitive input parameters 

(which cannot be determined precisely enough through measurements) within a realistic range. 

**Rule-of-thumb:**

"If you’re going to do something **three times or more**, you should think about writing a **small package**"([Roger D. Peng, 2016](http://simplystatistics.org/2016/05/18/software-engineering-data-science/))

# “Wrapped“ models 

[WTAQ-2 (USGS)](http://water.usgs.gov/ogw/wtaq)

- R package: https://github.com/KWB-R/kwb.wtaq 

- Tutorial: https://kwb-r.github.io/kwb.wtaq 

In addition we also "wrapped" the following models (but these are not yet available on Github):

- [EPANET (USEPA)](https://www.epa.gov/water-research/epanet) 

- [VS2DI (USGS)](http://wwwbrr.cr.usgs.gov/projects/GW_Unsat/vs2di1.3/) 

# More details on "wrapping" concept:

Check out our conference paper ["Wrap your model!" (Sonnenberg et al. 2014)](http://doi.org/10.13140/RG.2.1.2140.3683)