360DigiTMG Data Scientist Interview Questions, Process, and Tips

Using R as a calculator to compute values for a Data Scientist interview question.

• Use R's console to input mathematical expressions and compute values.

• Make sure to follow the order of operations (PEMDAS) when entering expressions.

• Use functions like 'sqrt()' for square roots and 'exp()' for exponentiation.

• Remember to assign variables using the '<-' operator before using them in calculations.

Compute statistics of a given time value in R

• Use lubridate package to work with time data in R

• Calculate summary statistics like mean, median, min, max, and standard deviation

• Convert the time value to a time object before performing calculations

Using R to create two matrices and perform matrix multiplication.

• Create two matrices using matrix() function in R.

• Use %*% operator for matrix multiplication.

• Ensure the dimensions of the matrices are compatible for multiplication.

The kNN classifier is run on the iris data to make predictions based on nearest neighbors.

• kNN classifier is a type of supervised machine learning algorithm that can be used for classification tasks.

• The output will be the predicted class labels for the iris data based on the nearest neighbors.

• Interpreting the output involves understanding how the algorithm has classified the data points.