Hello!
I have predicted the stream flow with two methods:
The first method is Bayesian network that predicts the class of stream flow and the second method is SVR (Support Vector Regression) that predicts the approximate amount of stream flow.
Since I used Nash-Sutcliff coefficient for evaluate second method I need Nash-Sutcliff coefficient for first method so I can compare two methods.
Hello,
Calculation of the NS value is easy in excel using the observed and simulated records in different time steps. I can send you a sample file.
Nash-Sutcliffe coefficient formula is given here:
https://en.wikipedia.org/wiki/Nash%E2%80%93Sutcliffe_model_efficiency_coefficient
This is a measure for model skill assessment, so you should have some validation data, so find NSC for model 1 and validation data and then model 2 and validation data. Then you can compare model 1 and model 2.
Keep in mind that NSC alone is not enough for assessing "goodness of fit" it is a good measure but not enough. You have to use other measures along that for better confidence.
Look at my slides on "Validation" in this note:
Preprint Lecture Notes: "Introduction to Verification and Validation,...
Hi Raoof Mostafazadeh do you still have the sample file to calculate the NS in Excel? Thank you!
Camila Alejandra Gordon ,
Here is an excel file along with some other statistical measures.
Raoof Mostafazadeh Thank you so much for sharing this with me, can I contact you via mail, for some questions about research? I'm working on flood risk models. Thanks again and have a nice day.
Raoof Mostafazadeh thank you for the useful files.
Could you please tell me from which book you have the formulas (the table) that you've mentioned in your word-document?
Thank you!
Mariyana Georgieva
You can find that in the following:
Book: Soil Hydrology, Land Use and Agriculture: Measurement and Modelling
By: Manoj Shukla
and here is the link (gr through page 342):
https://books.google.com/books?id=NwcfRl_MvkgC&pg=PA342&lpg=PA342&dq=%22Recommended+%E2%80%98goodness-of-fit%E2%80%99+measures+for+model+validation%22+(after+legates+and+mccabe,+1999)&source=bl&ots=ujaH8ObQll&sig=ACfU3U3N0s5AbmJ16BPJewcO2S5k8mp0DA&hl=en&sa=X&ved=2ahUKEwj6uPr3nP3vAhXXIDQIHSqvDWEQ6AEwAHoECAIQAw#v=onepage&q=%22Recommended%20%E2%80%98goodness-of-fit%E2%80%99%20measures%20for%20model%20validation%22%20(after%20legates%20and%20mccabe%2C%201999)&f=false
Raoof Mostafazadeh thank you very, very much!
The infomration and files you gave me are very useful.
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