I think the following formula in unit 2.2 might be incorrect :

β/βπ=2/πβπ=1πβ(π¦πβ(π+π))=βΏπ

it should be

β/βπ=2/πβπ=1πβ(π¦πβ(πx+π))=βΏπ

Also, the following relation in 2.4 might have a small mistake as well.

**Finally, the logistic regression function can be defined as:**

β(π₯)=1 / (1 +π^βπ(π₯))

Then the displayed relation

β(π₯)={

0.5 > if π(π₯) < 0

0.5 < if π(π₯) > 0

}

Should actually be

β(π₯)={

0.5 < if π(π₯) < 0

0.5 > if π(π₯) > 0

}