070-773 Exam Training Practice Tests (Microsoft Analyzing Big Data with Microsoft R)]

Question 1

Note: This question is part of a series of questions that use the same or similar answer choices. An answer choice may be correct for more than one question in the series. Each question is independent of the other questions in this series. Information and details provided in a question apply only to that question.
You have a dataset that contains the physical characteristics of people.
You need to visualize a relationship between height and weight for a subset of observations in the dataset.
What should you use?

A. the rxHistogram function B. the Describe package C. the rxSummary function D. the rxQuantile function E. the ggplot2 package F. the rxCrossTabs function G. the summary function H. the rxCube function

Correct Answer: E

Question 2

You have a slow Map Reduce job.
You need to optimize the job to control the number of mapper and runner tasks.
Which function should you use?

A. RxComputeContext B. RxHadoopMR C. RxLocalParallel D. rxExec

Correct Answer: D

Question 3

You are running a large logistic regression for 1,000 feature variables by using the LoisticRegression() function in the MicrosoftML package. All of the predictor variables are numeric.
Currently, you specify the input variables separately by using the following formula.
Outcome ~ Feature000 + Feature001 + Feature002 + ... + Feature999
You discover that it takes 20 minutes to estimate each model.
You need to reduce the amount of time required to estimate each model without losing any information in the predictors.
What should you do?

A. Use princomp() on the correlation matrix of Features, and then use only the first 100 principle components to reduce the number of input variables. B. Use selectFeatures() to select the features that provide the most information about the outcome variable. C. Use stepControl() to perform stepwise regression to limit the number of variables that contribute to the model. D. Use concat() to create a single array variable named Features, and then specify a new formula named Outcome ~ Features.

Correct Answer: D

Question 4

You have an Apache Hadoop Hive data warehouse. RevoScalerR is not installed.
You need to sort the data according to the variables in the dataset.
What should you do?

A. Execute a Hive query that sorts the data, and then reads the results. B. Create a table in the ORC file format. C. Connect to the database by using an ODBC connection, and then use the rxSort function. D. Connect to the database by using an ODBC connection, and then use the rxDataStep function.

Correct Answer: A

Microsoft Analyzing Big Data with Microsoft R - 070-773 Exam Practice Test