How can you select k for k-means?

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Explain while working on a data set, how do you select important variables?

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You can roll a dice three times. You will be given $X where X is the highest roll you get. You can choose to stop rolling at any time (example, if you roll a 6 on the first roll, you can stop). What is your expected pay-out?

0 Answers   Facebook,

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Compare sas, r, python, perl?

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Write the formula to calculate r-square?

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Implement a sorting algorithm for a numerical dataset in Python.

0 Answers   Facebook,

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What are apis used for?

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What is machine learning and how can it be used for time series analysis?

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Explain the difference between an analyst and a data scientist?

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You are given a training dataset of users that contain their demographic details, the pages on Facebook they have liked so far and results of psychology test based on their personality i.e. their openness to like FB pages or not. How will you predict the age, gender and other demographics of unseen data?

0 Answers   American Express,

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How make you 3d plots/visualizations using numpy/scipy?

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Define a sql query?

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