Home » 30 Questions to test your understanding of Logistic Regression

# 30 Questions to test your understanding of Logistic Regression

• Siva says:

q.19. Option A should be training accuracy increases

• Faizan Shaikh says:

Updated. Thanks for pointing it out

• agabala says:

• Faizan Shaikh says:

Hi,

You may have misunderstood the term linear separability. If the training data are linearly separable, we can select two hyperplanes in such a way that they separate the data and there are no points between them, and then try to maximize their distance. But in q30 image, it is not so.

• agabala says:

Hi Faizan,

In question 22 the data is also not linearly separable

• Ankit Gupta says:

Actually question was partially completed so we have added additional information in the note section. Thanks for pointing out

• jagan mohan says:

linear seperable in the sense

• agabala says:

q.22 shows a non-linear decision surface and q.30 states, that logistic regression has a linear decision surface. I guess, author should indicate, when exactly the decision surface is linear

• Dattatraya Rathi says:

Thank you so much sharing a good knowledge

• Ankit Gupta says:

i am glad you find them useful

• Iron Man says:

In question no. 21 you yourself proved B1 for black is greater than B1 for green. So that makes the answer to be B.

• Amit Srivastava says:

Q. 28: I can count four local minima.

• Ankit Gupta says:

you are considering global minima as local minima.

• Isma says:

You could edit the post and put the answers in the end of the post, lol

• VIVEK BARSOPIYA says:

question 20 I guess should be n-1 classifiers.
the posterior probability should sum up to one.
so if p(c_1/x)+p(c_2/x)+….p(c_k/x)=1
therfore
p(c_k/x)= 1- sum(p(c_1/x)+…..p(c_(k-1)/x)
and we need the density estimate of only k-1 classes
and the classes are assigned by
arg max p(c_i/x)
Is there something i dont know about OVA?

• Suvo Pal says:

For question no. 29 blue line (learning rate = l1) converges faster than black or any other lines.
So probable answer should be l1>l2>l3

Am i missing something here ?