[geom_series] Add an exercise

[SylviaZhaooo]

Dear John @jstac,

Same as before, I changed the last part, the Keynesian model with plots and code snippets part, into an exercise since the logic of this model has been illustrated so it is easy to have the same model as an exercise.

Fixes #401

Best,
Sylvia

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[HumphreyYang]

Hi @mmcky,

I think the connection issue comes up again from the Anaconda side:

  ('Connection broken: IncompleteRead(260439 bytes read, 1980267 more expected)', IncompleteRead(260439 bytes read, 1980267 more expected))

[mmcky]

thanks @HumphreyYang -- just triggered a rebuild.

[jstac]

Many thanks @SylviaZhaooo .

Does this pull request address a particular issue? (If yes, then you can put "Fixes #XXX", where XXX is the issue number, and the issue will be closed automatically when this PR is merged.)

Does the reader have enough information to complete the exercise? For example, do they need to know parameter values?

@shlff , could you please review this carefully and work with @SylviaZhaooo to finish it? If I look at https://669dffc4710cf5c7cb257aa4--taupe-gaufre-c4e660.netlify.app/geom_series, it seems that a lot of extra content is included in the solution --- "We now examine what will happen..."

[shlff]

Thanks @SylviaZhaooo and @jstac .

Hi @SylviaZhaooo I had a look at this PR, and I suggest we break this section into 2 or more exercises

• 1: plot the time path;
• 2: plot the time paths with different marginal propensity to consume, or varied investment or different government spending (the second could be broke into parts))

After breaking it down, we then polish the exercise titles and solutions one by one.

[mmcky]

@SylviaZhaooo not 100% sure which values abovementioned is referring to. Would it be possible to clarify?

[mmcky]

thanks @shlff and @SylviaZhaooo for this PR. Just a couple of final questions to go.

[SylviaZhaooo]

Hi @mmcky,

I think these are values = [0.3, 0.4] for the comparative analysis just like what we did for i in the first question of the third exercise and I revised the statement and kept it the same as the statement for i.

[shlff]

Thanks @SylviaZhaooo and @mmcky .

Hi @SylviaZhaooo , I had a look at the code and I suggested the following modifications to improve the clarity.

You can vote if we should adopt these.

[SylviaZhaooo]

Hi @shlff,

Thanks for your suggestions! I've reviewed your modifications and committed all the changes. Let me know if there’s anything else you’d like me to adjust or if further improvements are needed.

[shlff]

Thanks @SylviaZhaooo . It looks better to me now.

If you are happy with it, then we could hand it over to @mmcky for a final review.

Hi @mmcky here is a link to the most recent preview: https://670a4ceac856cc023983ef0f--taupe-gaufre-c4e660.netlify.app/geom_series

[mmcky]

thanks @shlff and @SylviaZhaooo -- I think this is looking good. 👍

[mmcky]

@jstac this is ready for final review and merge.