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R for Data Science by Dan Toomey

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Questions

Factual

  • How can you decide whether to use Pearson, Kendall, or Spearman as a method for correlation?
  • When would you want to see a small degree of freedom in the correlation results?
  • Most of the examples used common default parameters. Explore the same examples with nondefault parameters.

When, how, and why?

  • Why do the polychoric functions take so long to process?
  • Why are the values chosen in the polychoric responses correlated?
  • Explain the threshold values that were calculated.

Challenges

  • Is there an easier way to develop the 2 x 2 matrix needed as input to the tetrachoric function?
  • How could you account for trends in investment vehicles when analyzing stock market returns versus fixed instruments?

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