# Check Structural Identifiability with some fixed parameters
**URL:** https://discourse.julialang.org/t/check-structural-identifiability-with-some-fixed-parameters/88782
**Category:** General Usage
**Created:** [October 15, 2022, 4:52pm UTC](https://discourse.julialang.org/t/check-structural-identifiability-with-some-fixed-parameters/88782 "2022-10-15T16:52:28Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@mehdi\_lotfi](https://discourse.julialang.org/u/mehdi_lotfi)
#### Post date: [October 15, 2022, 4:52pm UTC](https://discourse.julialang.org/t/check-structural-identifiability-with-some-fixed-parameters/88782/1 "2022-10-15T16:52:28Z")
I am using StructuralIdentifiability.jl package to check the Identifiability of ODE by fixing some model parameters. The model includes 7 variable states and 22 parameters of which 12 of those are fixed. (I defined fixed parameters by param\_values as Dict.)
I have googled it and found nothing more except using StructuralIdentifiability.set\_parameter\_values(ode, param\_values) function, but when I use it and define param\_values by param\_values = Dict(ηψᵥ=\>19.03,γc=\>1.31,ψₛ=\>4_10e-3,ξ=\>5_10e-9,
μₛ=\>0.14,μᵢ=\>0.15,ψᵣ=\>0.02,αᵣ=\>0.001,μᵣ=\>0.02,
κ=\>0.05,μₐ=\>0.02,νₐ=\>0.07
)
, face the following error: Any suggestion or other solutions??
MethodError: no method matching set\_parameter\_values(::ODE{Nemo.fmpq\_mpoly}, ::Dict{Nemo.fmpq\_mpoly, Float64})
Closest candidates are:
set\_parameter\_values(::ODE{P}, ::Dict{P, T}) where {T\<:AbstractAlgebra.FieldElem, P\<:AbstractAlgebra.MPolyElem{T}} at ~/.julia/packages/StructuralIdentifiability/ooOlO/src/ODE.jl:62
---
### Author:  [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)
#### Post date: [October 15, 2022, 8:14pm UTC](https://discourse.julialang.org/t/check-structural-identifiability-with-some-fixed-parameters/88782/2 "2022-10-15T20:14:18Z")
Open an issue on the repo.
---
### Author:  [@mehdi\_lotfi](https://discourse.julialang.org/u/mehdi_lotfi)
#### Post date: [October 16, 2022, 11:33am UTC](https://discourse.julialang.org/t/check-structural-identifiability-with-some-fixed-parameters/88782/3 "2022-10-16T11:33:44Z")
Thank you, Chris.
I am not familiar with the repo section; where is that?
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### Author:  [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)
#### Post date: [October 16, 2022, 11:49am UTC](https://discourse.julialang.org/t/check-structural-identifiability-with-some-fixed-parameters/88782/4 "2022-10-16T11:49:35Z")
> **[Issues · SciML/StructuralIdentifiability.jl](https://github.com/SciML/StructuralIdentifiability.jl/issues)**
>
> Fast and automatic structural identifiability software for ODE systems - Issues · SciML/StructuralIdentifiability.jl