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eq: 2.22 subscript missing for y_i (digital edition, cannot confirm for printed) #10

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keblu opened this issue Nov 5, 2019 · 4 comments

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@keblu
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keblu commented Nov 5, 2019

Small subscript missing in equation 2.22

In the digital edition (maybe printed also) we have:

lhd = Πni=1 p(yi | xi) =Πni=1 piyi(1-pi)1-yi

should be:

lhd = Πni=1 p(yi | xi) =Πni=1 piyi(1-pi)1-yi

Note the added subscript at piyi instead of piyi

@keblu
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keblu commented Nov 5, 2019

Realized that there is a couple of those in the kindle edition, I guess that this won't be the case in the printed one.

@mataddy
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mataddy commented Nov 5, 2019

Thanks keblu! Where else did you catch these?

@keblu
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keblu commented Nov 5, 2019

  1. paragraph right after eq. 2.30, for var(a'ε) = a[X] var(ε) a, I guess [X] is for '.

  2. paragraph right after that you have diag([σ2122,...,σ2n]) instead of diag([σ2122,...,σ2n])

  3. paragraph after eq. 2.31 you have σ2i instead of σ2i

  4. Seems like an error here in Section Space and time at the beginning you have:

log(yt) = α + βtt + βmt + εt

in that case there is two time β without subscript (indicating that this is the same coefficient), βtt is a bit strange since obviously t at index t will be t, it should probably be simply βt, and εt should be εt.

  1. Paragraph where you have: A more subtle issue is that of autocorrelation .

A bit after that you have:

The errors appear to be correlated over time, such that εt is related to εt-1. That relationship violates our basic independence assumption, which holds that εi ⟂⟂ εj for all i ≠ j.

should probably be:

The errors appear to be correlated over time, such that εt is related to εt-1. That relationship violates our basic independence assumption, which holds that εi ⟂ εj for all i ≠ j.

  1. Section where it is written: It is also possible to extend the idea of the AR to higher lags

AR(p): Yt= β0+ β1Yt-1 + ... + + βpYt-p + ε.

there is a missing subscript on ε, should be εt

  1. Just before eq. 3.1 :

suppose you have data [x1,y1]...[xn,yn]

should be:

suppose you have data [x1,y1]...[xn,yn]

  1. before eq. 3.4

λ1> λ2... > λT should probably be: λ1> λ2>... > λT

For now that is about it. Again, I don't have the printed edition so I am not sure if some of those are because of the Kindle app.

@mataddy
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mataddy commented Nov 5, 2019

Thanks! Massively helpful. If you find more please put them here. Subscript errors were a nightmare in production and we obviously didn’t catch them all. Appreciate the edits. Hope you like the book!

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