# How to do NMC method in JEDI-MPAS? **URL:** \ **Category:** JEDI\ **Created:** [May 8, 2023, 2:11am UTC](https://forums.jcsda.org/t/how-to-do-nmc-method-in-jedi-mpas/472 "2023-05-08T02:11:36Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![jw12](https://avatars.discourse-cdn.com/v4/letter/j/5fc32e/32.png) [@jw12](https://forums.jcsda.org/u/jw12)\ **Post date:** [May 8, 2023, 2:11am UTC](https://forums.jcsda.org/t/how-to-do-nmc-method-in-jedi-mpas/472/1 "2023-05-08T02:11:36Z")
I am looking for a way to do NMC method in JEDI-MPAS, but I am not sure how to write the namelist. Is there a sample yaml to do NMC method? Do I specify the perturbation files in the `ensemble` section or some other sections in the yaml? Thanks! ---
**Author:** ![byoung-joo](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/byoung-joo/32/126_2.png) [@byoung-joo](https://forums.jcsda.org/u/byoung-joo)\ **Post date:** [May 8, 2023, 4:01pm UTC](https://forums.jcsda.org/t/how-to-do-nmc-method-in-jedi-mpas/472/2 "2023-05-08T16:01:30Z")
Hi @jw12, Thank you for your interest in JEDI-MPAS. The capability asked is not yet supported in the released version of JEDI-MPAS. There are some scripts and sample yaml files in the released code [[here]](https://github.com/JCSDA/mpas-jedi/tree/master/test/covariance), but it is not supported due to the limited resources. Some specific questions can be still answered as shown in [Mpas-jedi be](https://forums.jcsda.org/t/mpas-jedi-be/316) . BJ ---
**Author:** ![jw12](https://avatars.discourse-cdn.com/v4/letter/j/5fc32e/32.png) [@jw12](https://forums.jcsda.org/u/jw12)\ **Post date:** [May 9, 2023, 1:22am UTC](https://forums.jcsda.org/t/how-to-do-nmc-method-in-jedi-mpas/472/3 "2023-05-09T01:22:18Z")
Hi @byoung-joo , I see. Actually I also saw that blog post you mentioned so I thought NMC method is supported. Anyway thank you for the reply. ---
**Author:** ![jw12](https://avatars.discourse-cdn.com/v4/letter/j/5fc32e/32.png) [@jw12](https://forums.jcsda.org/u/jw12)\ **Post date:** [May 9, 2023, 1:36am UTC](https://forums.jcsda.org/t/how-to-do-nmc-method-in-jedi-mpas/472/4 "2023-05-09T01:36:22Z")
Hi @byoung-joo , I have one more question then. How do I do static BE in JEDI-MPAS? I followed the documentation and it mentioned that `parameters_bumpcov.yaml` and `3dvar_bumpcov.yaml` are the yaml files for doing static BE, but I got a little confused about the method because in the sample yaml, static BE is calculated from 5 ensemble members at the analysis time. What is the implication of using ensemble members in the calculation of static BE? Thanks! ---
**Author:** ![byoung-joo](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/byoung-joo/32/126_2.png) [@byoung-joo](https://forums.jcsda.org/u/byoung-joo)\ **Post date:** [May 9, 2023, 3:43pm UTC](https://forums.jcsda.org/t/how-to-do-nmc-method-in-jedi-mpas/472/5 "2023-05-09T15:43:03Z")
> [@jw12](#): > > What is the implication of using ensemble members in the calculation of static BE? - `parameters_bumpcov.yaml` in the ctest list generates the static B files, through the generic component of JEDI, BUMP, which is under the SABER repository. From the yaml, it generates the univariate BUMP B files for variables [`temperature`,`spechum`, `uReconstructZonal`, `uReconstructMeridional`, `surface_pressure`]. Here, BUMP calculates the B statistics from five ensemble files as an input. - `3dvar_bumpcov.yaml` executes the variational application with 3dvar cost function using the univariate BUMP B files, which is generated by `parameters_bumpcov.yaml` - Note that the structure of overall B can change, depending on the configuration (and design). Hope this helps some of your questions. --BJ