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Comments on: The forecaster as a storyteller http://www.tvhe.co.nz/2012/08/03/the-forecaster-as-a-storyteller/ The Visible Hand in Economics Fri, 03 Aug 2012 01:23:29 +0000 hourly 1 https://wordpress.org/?v=6.9.4 By: Matt Nolan http://www.tvhe.co.nz/2012/08/03/the-forecaster-as-a-storyteller/#comment-39713 Fri, 03 Aug 2012 01:23:29 +0000 http://www.tvhe.co.nz/?p=7355#comment-39713 In reply to Matt Nolan.

I wouldn’t say that most forecasters are trying to answer the same question per see.  Even if we were to say this was the case with “macro” forecasters, the difference is usual due to differing views of exogenous variables – where the dearth of relevant data is endemic and the appropriate way to model them is relatively disagreed upon 😉

In this context I would also note that, contrary to the way we often here macroeconomists argue they do actually provide relatively similar forecasts – I would say that the marginal value a forecaster adds has more to do with their ability to identify what elements will be more important for their client, and help to translate these forecasts into a usable and identifiable way to deal with risk.  This makes the narrative component essential not just for helping to create the model – but for helping to create the output that clients value, which in turn explains why forecasters “sound” so different when their numbers are actually quite similar.

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By: jamesz http://www.tvhe.co.nz/2012/08/03/the-forecaster-as-a-storyteller/#comment-39711 Fri, 03 Aug 2012 01:06:30 +0000 http://www.tvhe.co.nz/?p=7355#comment-39711 In reply to Matt Nolan.

Sure, but doesn’t only (2) matter for forecasters at the margin? They’re all trying to answer the same questions using pretty much the same data and models, after all.

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By: Matt Nolan http://www.tvhe.co.nz/2012/08/03/the-forecaster-as-a-storyteller/#comment-39707 Fri, 03 Aug 2012 00:43:04 +0000 http://www.tvhe.co.nz/?p=7355#comment-39707 In reply to jamesz.

There are a few things that prevent that from being the case:

1)  The fact that models are generally made to answer specific questions – there is no general model

2)  The fact that there is missing data, implying that even if everyone was using the same objective model and data there is room for subjectivity in tying things together.

3)  The model informs how you look at the data just as much as the data informs what model to pick.

Without a general model and a perfect information set, I find the idea of a uniquely “right” story disingenuous. 

However, for a well specified question, and a given set of defined exogenous variables, we may be able to tie down a uniquely right story – but to me this relies a lot on how we define the question 😉

 

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By: jamesz http://www.tvhe.co.nz/2012/08/03/the-forecaster-as-a-storyteller/#comment-39705 Fri, 03 Aug 2012 00:30:55 +0000 http://www.tvhe.co.nz/?p=7355#comment-39705 In reply to Matt Nolan.

I think the difference between your descriptions and the rhetorical approach here is the separation of model and story. I thought you might consider the story a consequence of the model, which might result in one uniquely ‘right’ story.

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By: Matt Nolan http://www.tvhe.co.nz/2012/08/03/the-forecaster-as-a-storyteller/#comment-39703 Fri, 03 Aug 2012 00:21:13 +0000 http://www.tvhe.co.nz/?p=7355#comment-39703 And the advantage of using the economic method to do this is that the assumptions made are transparent 🙂

I’m not sure why you thought I would disagree with this at all – given it is exactly the type of argument I’ve long held onto for economic modeling. 

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