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POCreating a variable from a condition with more than 2 arguments
 

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  1. POCreating a variable from a condition with more than 2 arguments
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    <p>Following is an easy version of what I'm trying to do. I have the following vector:</p> <pre><code>wage = 1:10 # Generate a sequence from 1 to 10 </code></pre> <p>And I want to create another vector <code>wage_level</code> such that:</p> <p>(i) <code>wage_level</code> is <code>"low"</code> if <code>wage</code> less than <code>5</code></p> <p>(ii) <code>wage_level</code> is <code>normal</code> if <code>wage</code> is equal to <code>5</code></p> <p>(iii) <code>wage_level</code> is <code>high</code> if <code>wage</code> is greater than <code>5</code></p> <p>I know I can use nested <code>ifelse</code> statements to do it, however, as I pointed out earlier, this is but a simplified version of what I really want to do because I have about 15 alternatives.</p> <p><strong>Edit</strong></p> <p>The answer provided below makes use of the <code>cut()</code> function, which actually works well in many cases. However, it does not seem to "work" in my case. Following is the detailed explanation.</p> <p>I was able to use the <code>cut()</code> function to create the <code>wage_level</code> vector:</p> <pre><code>wage = runif(10, 1, 10) # Randomly generate 10 values between 1 and 10 # Here I use the cut() function wage_level = cut(wage, breaks = c(1, 4, 6, 10), labels = c("low", "normal", "high"), include.lowest = TRUE) &gt; wage [1] 5.522422 4.793292 8.161671 5.480415 1.396909 3.403013 4.940242 7.762142 6.364159 4.603998 &gt; wage_level [1] normal normal high normal low low normal high high normal Levels: low normal high </code></pre> <p>Now, let's suppose I want to use the <code>wage_level</code> vector to create another vector (the <code>rating</code> vector) using the <code>cut()</code> function. The condition to create the <code>rating</code> vector is as follows:</p> <p>(i) <code>rating</code> is <code>"1"</code> if <code>wage_level</code> less than <code>"low"</code></p> <p>(ii) <code>rating</code> is <code>2</code> if <code>wage_level</code> is equal to <code>"normal"</code></p> <p>(iii) <code>rating</code> is <code>3</code> if <code>wage_level</code> is greater than <code>"high</code></p> <p>My problem is that using the <code>cut()</code> function will not make the <code>rating</code> vector a <code>numeric</code> vector will the values of my choice. The following code does not work:</p> <pre><code>rating = cut(as.numeric(wage_level), breaks = c(0, 1, 2, 3), labels = c(1.2, 6.5, 8.9), include.lowest = TRUE) &gt; as.numeric(rating) [1] 2 2 3 2 1 1 2 3 3 2 </code></pre> <p>I mainly have two problems here:</p> <p>(i) I would have preferred a way to use the actual strings (i.e. "low", "normal" and "high") instead of the labels indexes</p> <p>(ii) The values in the <code>rating</code> vector have nothing to do with the values I specified.</p> <p>Any other method to achieve the desired result?</p> <p>Thank you very much for your help :)</p>
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    1. USSavedByJESUS
    1. USSavedByJESUS
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      1. POCreating a variable from a condition with more than 2 arguments
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      1. VTUpMod
    1. COYou're probably looking for `cut()`
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      1. POCreating a variable from a condition with more than 2 arguments
      1. USndoogan
    2. CO@ndoogan is spot on. I've found that working with a large amount of interval breaks, it is helpful to have the `breaks` and `labels` be their own variables, often created with `seq` and `paste0`
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      1. USRicardo Saporta
    3. CO@ndoogan Please, I edited my question, would you please take a look?
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      1. USSavedByJESUS
 

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