Interview Question

Describe a project you're proud of If I interview your PhD advisory, and I invite him/her to describe your strength and weakness, what do you think he will say.

The homicide rate in Scotland fell last year to 99 from 115 the year before. Is this reported change really noteworthy?

Is mean imputation of missing data acceptable practice? Why or why not?

Given a list of all followers in format: 123, 345;234, 678;345, 123;…where the first column contains the Id of the follower, and the second one is the Id of who’s followed, find all mutual follows(pair 123, 345 in the example ...

Given a 2-column file with user codes and counts, retrieve the top-k users based on a score that is a function of the number of times they appear on the file and these counts.

What would you change in Twitter App?

What features would you use to build recommendation algorithm for users?

How to combine two datasets?

How can you illustrate a tree-based system with a SQL query?

If you got the job at Twitter and got access to all of its data what kind of data analysis would you like to perform?