Calculation of p-factor

[Keewook Kim]

Dear users,

In SWAT-CUP manual, p-factor is defined as the percentage of measured data bracketed by the 95PPU. So, the p-factor can be estimated with the following equation.

p-factor=(# of observations within 95PPU)/(total # of observations)

When I calculate p-factor manually with the above equation, there is differences in the p-factors calculated by SWAT-CUP. In the end of the attached "95PPU.txt", SWAT-CUP calculated p-factor as 0.90 while my manual calculation with the time series in "95PPU.txt" is 0.874059. r-factor and the other goodness-of-fit statistics show consistency between SWAT-CUP calculation and my manual calculation.

Can you please indicate if I miss anything?

Thank you.

Keewook.

[Abbaspour, Karim]

When calculating p-factor you have to account for error also. I assume 10% error in the examples provided, but user should judge if it is more. So your observation +|- the error should be considered.

Karim

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<95ppu.txt>

[Abbaspour, Karim]

Then your model is not very correct. Look at the bulk watershed values in the output.std to determine what is going on in the watershed.

Karim

 

 

 

From: swat...@googlegroups.com [mailto:swat...@googlegroups.com] On Behalf Of Ray Wood
Sent: Monday, April 03, 2017 3:36 PM
To: SWAT-CUP
Subject: Re: Calculation of p-factor

 

Dear sir,

    how did you do it ? Teach me, please......I create the 95PPU plot, but I can't get the amount of observation potions within 95PPU.

ray

在 2016年7月30日星期六 UTC+8上午2:58:46，Keewook Kim写道：

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[Abbaspour, Karim]

Also makes sure you follow the protocol here:

http://www.sciencedirect.com/science/article/pii/S0022169415001985

 

 

 

From: swat...@googlegroups.com [mailto:swat...@googlegroups.com] On Behalf Of Ray Wood
Sent: Monday, April 03, 2017 3:36 PM
To: SWAT-CUP
Subject: Re: Calculation of p-factor

 

Dear sir,

    how did you do it ? Teach me, please......I create the 95PPU plot, but I can't get the amount of observation potions within 95PPU.

ray

在 2016年7月30日星期六 UTC+8上午2:58:46，Keewook Kim写道：

Dear users,

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[Ray Wood]

Thank you Dr. Abbaspour 

 ray

在 2017年4月3日星期一 UTC+8下午10:07:30，Abbaspour写道：

[Tesfa Worku]

is there anybody who can tell me how can we calculate r-factor and p-factors in R?

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<95ppu.txt>

[Tesfa Worku]

Dear all,  is there anybody who can tell me how can we calculate r-factor and p-factors in R? send me through my email. thanks 

[Tesfa Worku]

Thank you very much. what about r-factors? 

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With best Regards
Tesfa Worku
PhD. In Hydrological Modelling 

Phone #: +251 912284522, +251930518723, +91 9760911139

email: hope...@gmail.com; worku....@iitr.ac.in

PoBox: 91, Addis Ababa Ethiopia 

Web: https://scholar.google.co.in/citations?user=C5UML0oAAAAJ&hl=en

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