Show HN: Trajectory – an open-source educational tool to model financial future(blabr.io)

13 pointsby jmort11 ปีที่แล้ว4 comments

Show HN: Trajectory – an open-source educational tool to model financial future

http://blabr.io/?2efbdcc151a2e3e57d75

3 comments

jmort11 ปีที่แล้ว

Hey all, I wrote this little Blab after struggling to visualize the impact of budgeting and investments in the long term. People kept telling me to save and invest, but I wanted to see empirically why this is true.

Features I'd like to add:

  - Better taxation rules
  - Specific asset classes and investment accounts with 
    associated taxation, withdraw limits, and contribution limits
  - Investment allocation strategy with a changing risk profile 
    and tax conscious account allocation
  - Social security income
  - Highlighting the "important" factors 
    (i.e., the ones that impact the plot the most)
  - A probabilistic simulation to get a better result estimate 
    (i.e., confidence intervals)

If you want to contribute, that'd be awesome! You can also easily fork it. If you have questions, I'm happy to answer them here!

gballan11 ปีที่แล้ว

Blabr dev here. We're working on an improved plotting widget, plot2 [0], that you're welcome to try (note how it's imported in the defs section). For example, see [1] for plot2 applied to "Trajectory". It is fairly sound, but there are some issues with escaping. So, e.g., we need yLabels: ["\\$ $\\times 1000$"], which is a bit ugly--but it works.

[0] http://blabr.io/?7b662930a33b1053072a

[1] http://blabr.io/?7d4d0cc9f423800f23e9

mvclark11 ปีที่แล้ว

Another Blabr dev here. This is a really nice blab. We'd targeted Blabr for scientific computing (and, in particular, for STEM and conceptual modelling), but you've demonstrated that it also works well for other kinds of online, interactive computation.

Based on your work, it occurs to us that we need to improve some things for non-scientific applications, e.g., number formatting (dollars/cents, thousands separators). Please let us know if there are any other features that would help you do this kind of financial modelling work. Or any feedback in general. Thanks!

jmort11 ปีที่แล้ว

Thanks! Really an excellent tool! I'd originally written a shiny app, but this was much better!

Other than the plot (thanks, gballan), it would be nice to adjust the width of layout cells, especially for the code cells. It would also be cool to adjust the spacing between cells to reduce whitespace when another cell in the same row takes up a huge amount but others do not.

I was not clear how to place markdown text in between or after tables and sliders but might have just missed how to do that.

Thanks again!