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Online Data Science & Analytics Test

Topics Covered

  • Introduction to Data Science
  • Data visualization
  • Machine Learning Techniques
  • Modern data science with r
  • Data science aptitude
  • Analytics with R & other Tools
  • Exploratory Data Analysis
  • Data Manipulation using R
  • Introduction to Statistics
  • Regression Analysis

Useful for hiring

  • Data Scientists
  • Data Science Engineer
  • Data Science Developer
  • Data Science Associate
  • Data Visualization Designer
  • Data Visualization Analyst
  • Data Analyst
  • Machine Learning Engineer

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Talent Acquisition Manager
Question

Suppose I want to extract the first column of each matrix in the list. How I can do that?

Answer
    • zapply(x, function(elt) { elt[,1] })

    • lapply(x, function(elt) { elt[,1] })

    • extract(x, function(elt) { elt[,1] })

Question

I need to save the plot to PDF file, what should I do?

Answer
    • Construct the plot on the screen device and then copy it to a PDF file with dev.copy2pdf()

    • Open the screen device with quartz(), construct the plot, and then close the device with dev.off().

    • Open the PostScript device with postscript(), construct the plot, then close the device with dev.copy2pdf().

    • None of the mentioned

Question

What does the summaryRprof() function do?

Answer
    • tabulates the R profiler output and calculates how much time is spent in the first function

    • tabulates the R profiler output and calculates how much time is spend in which function

    • tabulates the R profiler output and calculates how much time is spend in all functions

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