Data collection and preprocessing
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Data collection and preprocessing questions with answers

86 multiple-choice questions. Open any question for its answer and explanation.

  1. Point out the correct statement.
  2. Which data collection method involves the collection of data at regular intervals over a period of time?
  3. tidyr is a reframing of . . . . . . . . designed to accompany the tidy data framework.
  4. What type of data collection method involves manipulating one or more variables to observe their effects on other variables?
  5. Which of the following join is by default used in plyr package?
  6. What is the primary goal of data preprocessing in the context of machine learning?
  7. What is the purpose of data sampling in data collection?
  8. Processing data includes subsetting, formatting and merging only.
  9. Which of the following package is used for reading excel data?
  10. Which of the following is another name for raw data?
  11. httr package does not work well with facebook and twitter API.
  12. What does the acronym "ETL" stand for in the context of data preprocessing and integration?
  13. What is the process of transforming categorical data into numerical values called?
  14. Which of the following function is good for the automatic splitting of names?
  15. Which of the following is a common technique for handling imbalanced data in classification problems?
  16. Point out the correct statement.
  17. Which of the following function is used for determining missing values?
  18. What is the term for the process of handling missing data in a dataset by estimating values based on available data?
  19. Which type of data collection method involves asking questions to gather information from respondents?
  20. Point out the wrong statement.
  21. Which of the following is NOT a common data preprocessing technique?
  22. Which of the following is an important parameter of read.table function?
  23. Which of the following is a trait of tidy data?
  24. Which of the following function is used for loading flat files?
  25. Which of the following function is used for searching text strings by means of regular expression?