# Parametric model

5 years 6 months ago #410 by nikitak
Parametric model was created by nikitak
hello

I wanted to ask about the solution of parametric models.
Is it possible to solve parametric model (like Austria PVC model solved using Gabi, Excel, and Umberto given in Practical handbook for MFA) using STAN?

Hoping for a quick response.

Thank you

Nikita K.

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4 years 11 months ago #429 by a.fritze
Replied by a.fritze on topic Parametric model
Hi Nikita,

I´m not quite sure, what you mean.

You can define linear relationships of flows. that might be the closed to what I understand when i hear parametric model?
But you may elaborate your question, a bit. What specifically do you want to do.

Best regards from Berlin.

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4 years 11 months ago #430 by nikitak
Replied by nikitak on topic Parametric model
Yes.
I wanted to solve linear equations or equations with dependent parameters.

For example "Austria PVC Model", this example is provided for a solution using Gabi. I wanted to solve using Stan

Sample equation:

Export Rate = X value
Sales = Y value
Export = Export Rate*Sales

Thank you for your response.

Best Regards,
Nikita

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4 years 11 months ago #431 by a.fritze
Replied by a.fritze on topic Parametric model
Hi Nikita,

if you go to Edit > Edit relation... you can define linear relationships of the processes.
I just tried that for the year 1960, as you can see in the screenshot below.
I just defined 2 relationships and set the values for recycling and sales in 1960.

However, as Stan is not able to work with non-linear fuctions you need to calculate the sales rate (hird-order polyno-mial function) outside STAN (in Exccel for instance and copy the values into STAN [FAQ as a section on how to import values from excel)
Attachments:

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4 years 11 months ago #432 by nikitak
Replied by nikitak on topic Parametric model
Thank you very much for your response.

I will try to do it this way.

Best Regards,
Nikita from India

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