Correct typos in black_litterman

[lingdixu]

black_litterman:

Modification:

1. To begin, we'll take for granted that means are more difficult to estimate that covariances and will focus on how Black and Litterman -> more difficult to estimate than covariances

2. towards the conservative market view, $\mu{BL}$. that leads to the more conservative market portfolio -> towards the conservative market view, $\mu{BL}$, that leads to the more conservative market portfolio (change period to comma)

3. Equation 10, expectation had an unmatched right bracket

not sure:

For utility function argument $w' (\vec r - r_f {\bf 1}) $, $$ {\sf T} (\vec r - r_f {\bf 1}) = w' \mu + \zeta - \frac{1}{2\theta} w' \Sigma w $$

Should it be $ {\sf T} w' (\vec r - r_f {\bf 1}) = w' \mu + \zeta - \frac{1}{2\theta} w' \Sigma w $?

What is $\zeta$?

[AnjuJoon]

@jstac this looks fine

[natashawatkins]

Hi @lingdixu -- would you be able to edit or make an issue here: https://github.com/QuantEcon/lecture-source-py/blob/master/source/rst/black_litterman.rst

The first two typos seem find, but I'm not sure which equation you are referring to, and I'm not sure about the zeta

We should delete this file from QuantEcon.notebooks

[natashawatkins]

Ok equation 10 has also been fixed on the main lecture site -- still not sure about your last comment.