How to check the frequency distribution of a categorical variable?
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What is nosql? Name some examples of nosql databases. What is a key value store? What is column storage? What is a document database?
Can you compare the validation set with the test set?
What will be the output of runif (7)?
Can you write the formula to calculate r-square?
Define the term cross-validation
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Why is data cleaning essential in data science?
A disc is spinning on a spindle and you don't know the direction in which way the disc is spinning. You are provided with a set of pins.How will you use the pins to describe in which way the disc is spinning?
What packages are used for data mining in python and r?
A certain couple tells you that they have two children, at least one of whom is a girl. What is the probability that they have two girls?
What is need of principal component analysis?
What are the roles and responsibilities of a data scientist?
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