title: no applicable method for 'filter_' applied to an object of class "c('double', 'numeric')"
body: <p>Using the below code, I am trying to filter my dataset so that only those who are CG_less14==0 &amp; CG_High14==0 to be selected. I got an error:  no applicable method for 'filter_' applied to an object of class "c('double', 'numeric')". Is something wrong with my code?</p>
  
  <p><code>married_noncare &lt;-  filter (all_sample, CG_less14==0 &amp; CG_High14==0)
  </code></p>