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A person is using search engine to find something, you know nothing about her/him, how do you come up with an algorithm that will predict what she/he needs after the user types only a few letters?
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55 years 0 Answers 750 views Great Grand Master

Question
What are some differences you would expect in a model that minimizes squared error, versus a model that minimizes absolute error? In which cases would each error metric be appropriate?
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55 years 0 Answers 691 views Great Grand Master

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You notice a system uses a lot of triggers to enforce foreign key constraints, and the triggers are error-prone and difficult to debug. What changes can you recommend to reduce the use of triggers?
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55 years 0 Answers 1778 views Great Grand Master

Sorry it's a private question.

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R dialect has a few bundles for tackling a specific issue. How would you settle on a choice on which one is the best to utilize?
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55 years 0 Answers 1027 views Great Grand Master

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Imagine, you are given a dataset consisting of variables having more than 30% missing values. Let’s say, out of 50 variables, 8 variables have missing values, which is higher than 30%. How will you deal with them?
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55 years 0 Answers 1166 views Great Grand Master

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In a dataset, various cells have 0 instead of nan. How to fill the zeroes with mean or median.
in progress 0
55 years 0 Answers 911 views Master

Question
SUBSCRIPTIONS user_id start_dt end_dt 1 01/01/18 31/03/18 2 01/02/18 30/04/18 3 01/01/18 31/01/18   CM first_dt last_dt 01/01/18 31/01/18 01/02/18 28/02/18 01/03/18 31/03/18 Find no. of subscribers each month or MoM. Output be like : Month             subcriber_count Jan’18              2 Feb’18             2 Mar’18            2 Apr’18             1
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55 years 0 Answers 1018 views Member