Databricks Certified Professional Data Scientist Exam - Topic 4 Question 47 Discussion

Actual exam question for Databricks's Databricks Certified Professional Data Scientist exam

Question #: 47
Topic #: 4

[All Databricks Certified Professional Data Scientist Questions]

You have collected the 100's of parameters about the 1000's of websites e.g. daily hits, average time on the websites, number of unique visitors, number of returning visitors etc. Now you have find the most important parameters which can best describe a website, so which of the following technique you will use

APCA (Principal component analysis)

BLinear Regression

CLogistic Regression

DClustering
Principal component analysis . or PCA, is a technique for taking a dataset that is in the form of a set of tuples representing points in a high-dimensional space and finding the dimensions along which the tuples line up best. The idea is to treat the set of tuples as a matrix M and find the eigenvectors for MMT or M T M . The matrix of these eigenvectors can be thought of as a rigid rotation in a high-dimensional space. When you apply this transformation to the original data, the axis corresponding to the principal eigenvector is the one along which the points are most 'spread out,11 More precisely this axis is the one along which the variance of the data is maximized. Put another way, the points can best be viewed as lying along this axis, with small deviations from this axis.

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Suggested Answer: A

by Quentin at Oct 03, 2023, 09:28 PM

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Denna

3 months ago

Not sure if PCA is the best choice, what about clustering?

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Kayleigh

3 months ago

Totally agree, PCA helps in visualizing high-dimensional data effectively!

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Lorita

3 months ago

Wait, isn't PCA a bit complex for just finding important parameters?

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Ernestine

4 months ago

I think linear regression could work too, but PCA seems more fitting here.

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Nguyet

4 months ago

PCA is definitely the way to go for dimensionality reduction!

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Evangelina

4 months ago

I feel like linear regression might not be appropriate since we're not predicting a specific outcome, but I’m a bit confused about when to use logistic regression.

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Nickole

4 months ago

I practiced a similar question, and I believe PCA was highlighted as the best method for summarizing data. It makes sense for this scenario.

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Doyle

4 months ago

I'm not entirely sure, but I remember something about PCA being used for feature extraction. It seems relevant, but could clustering also work?

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Tegan

5 months ago

I think PCA is the right choice here since it helps reduce dimensionality and identify the most important features.

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Laurena

5 months ago

PCA is the way to go for this question. It's a powerful technique for dimensionality reduction that can help us identify the most important website parameters. I'll make sure to explain the key steps of the PCA algorithm and how it applies to this problem.

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Alpha

5 months ago

I'm a little confused by all the options presented here. What's the difference between linear regression and logistic regression? And how would clustering be used in this context? I'll need to review my notes to make sure I understand the pros and cons of each technique.

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Jacob

5 months ago

PCA is definitely the right choice here. It's perfect for identifying the key features that capture the most variance in a high-dimensional dataset like the website parameters we have. I feel confident I can explain the PCA approach well in my answer.

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Alethea

5 months ago

Hmm, I'm a bit unsure about this one. PCA, linear regression, and clustering all seem like they could be applicable. I'll need to think through the specifics of each method and how they might work for this problem.

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Veronika

5 months ago

This seems like a straightforward question on dimensionality reduction techniques. I think PCA is the way to go here since we're trying to find the most important parameters that can best describe the websites.

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Kassandra

5 months ago

Okay, let's see. We need to prevent VM1 and VM2 from accessing any other storage accounts, but still allow storage1 to be accessible from the internet. I think a private endpoint or a private link might be the way to go.

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Lucia

5 months ago

I'm not completely sure, but I feel like YAML could also be a default for some other CLI tools.

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Remedios

5 months ago

Okay, let me think this through. The question is asking for the hexadecimal reference for the text color, and the background is specified as black. So the answer must be the hexadecimal code for white.

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Lanie

5 months ago

Hmm, I think I remember learning about this in class, but I'm not totally sure. I'll have to think it through carefully.

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Tomoko

5 months ago

Triggering a PowerShell alert on the VM doesn't seem like the right approach here. I'm pretty sure we need to work in the Azure Security Center to set up the custom alert suppression rule.

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