Chpater 5 Typo

[rickiepark]

(p159) In first Eq., \Sigma_i = \frac{1}{n_i} S_W should be \Sigma_i = \frac{1}{n_i} S_i

[rickiepark]

(p159) In first code box, It's not critical but it's better to use np.cov(..., bias=True). By default, np.cov() use \frac{1}{n-1} not \frac{1}{n}. :)

[rickiepark]

(p170) In last sentence, \gamma = \frac{1}{2 \sigma} should be \gamma = \frac{1}{2 \sigma^2}

[rasbt]

(p159) In first Eq., \Sigma_i = \frac{1}{n_i} S_W should be \Sigma_i = \frac{1}{n_i} S_i

Hm, in my version this already looks correct. I think we fixed that in a reprint in the past already.

(p159) In first code box, It's not critical but it's better to use np.cov(..., bias=True). By default, np.cov() use \frac{1}{n-1} not \frac{1}{n}. :)

Hm, I'd say ideally we want n-1 but it probably won't make a big difference in practice.

(p170) In last sentence, \gamma = \frac{1}{2 \sigma} should be \gamma = \frac{1}{2 \sigma^2}

Thanks!