title: Subsetting data in R doesn't work
body: <p>I am trying to subset my data and for the life of me I cannot figure out why this isn't working. Here's a link to my data, which is a csv file <a href="https://outlookuga-my.sharepoint.com/personal/llipani_uga_edu/_layouts/15/guestaccess.aspx?guestaccesstoken=i5tSGumRPa3tw5P61Vi6PLqhgFE2cfRmqc5CB5bNizc%3D&amp;docid=020f9ab4931c24a0cb1258c53050a917c" rel="nofollow">Data</a>. I've tried these ways to subset, but they all just create a header with no observations.</p>
  
  <pre><code>alveolar.df &lt;- combine.df[combine.df$articulation == "velar_coronal", ]
  alveolar.df &lt;- subset(combine.df, articulation == "velar_coronal")
  alveolar.df &lt;- combine.df[combine.df$articulation %in% c("velar_coronal"), ]
  </code></pre>
  
  <p>Here is a sample of the data -</p>
  
  <pre><code>combine.df &lt;- structure(list(start = c(215.76, 278.78, 862.35, 1050.22, 512.59, 
  552.97), end = c(217.18, 280.68, 863.85, 1051.72, 515.02, 555.67
  ), articulation = c(" velar_coronal", " velar_labial", " velar_coronal", 
  " velar_coronal", " velar_coronal", " velar_coronal"), hometown = structure(c(1L, 
  NA, 2L, 3L, 4L, 4L), .Label = c(" Montana ", "  ", " San Leandr ", 
  " Southern California "), class = "factor")), .Names = c("start", 
  "end", "articulation", "hometown"), row.names = c(NA, 6L), class = "data.frame")
  </code></pre>