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Ricardo MARTINEZ-LAGUNES
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Thank you Kapio. To me, the letters and numbers look low resolution and there is not enough space between lines of text. The notebook looks different when you see it offline.
&[Wolfram Notebook][1] [1]: https://www.wolframcloud.com/obj/5e078df5-87d9-44f1-8432-11222055fb0d
Thank you for sharing Sangdon Lee. Here is something I did with stocks and flows, also using Stella and then translated to differential equations using Wolfram Language: **System dynamics and Hooke’s law** ...
&[Wolfram Notebook][1] [1]: https://www.wolframcloud.com/obj/e6da8844-4d90-40a3-b834-660d90395bc9
With Mathematica 12 it's very easy to import Stata files with the Import[] command. See: https://reference.wolfram.com/language/ref/format/DTA.html