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Goldman Sachs Summer Technology Analyst Interview Question

I interviewed in Jersey City, NJ and was asked:
"How would you show a correlation between two types of data?"
Tags: technical, probability
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Part of a Summer Technology Analyst Interview Review - one of 1,566 Goldman Sachs Interview Reviews

Answers & Comments

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***Probably asked based on my prior research experience***

I kinda fudged this one. I said that I'd compute the covariance of the two datasets. My interviewer took the answer but didn't show whether or not he liked that answer.
- Interview Candidate on Mar 16, 2012
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Covariance and correlation coefficient are based on Gaussian assumption, Spearman's rank correlation maybe a better choice if they are totally different types of data. A scatterplot before calculating these statistics is recommended.
- Arnie on May 17, 2012
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if two are both quantitative variables, use correlation. if both are categorical, use two way table. if one is quantitative and the other is categorical, then convert the quantitative one to a categorical one then make a two way table.
- T on Mar 20, 2013

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