DCL/ex3_10.html

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      <div data-datacamp-exercise data-lang='r' data-height =320><code data-type="pre-exercise-code">
  custom_seed(123)
           X <- runif(100, 0, 3)
           Y <- exp(-X) + rnorm(100, 0, .05)
           plot(Y ~ X)
           </code>
           
           <code data-type="sample-code">
           # compute the correlation between X and Y
           
           
           </code>
           <code data-type="solution">
           # compute the correlation between X and Y
           cor(X, Y)
           </code>
           <code data-type="sct">
           test_output_contains("cor(X, Y")
           success_msg("Correct! The correlation is able to capture the negative relationship between both variables. However it only measures linear dependencies, whereas the dependency here is clearly nonlinear (exponential).")
           </code></div>
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