title: How to select and add data to specific rows?
body: <p>How would you loop through the values in one column looking for a specific set of characters and then, if the row has those characters, assign a value specifically to that row in a new column?</p>
  
  <p>For example, in this problem we must assign one point to every disagreeing response and zero to the agreeing ones.</p>
  
  <pre><code>     Id   Gender   Age Participate Question            Response Score
      &lt;int&gt;  &lt;chr&gt; &lt;int&gt;       &lt;int&gt;    &lt;chr&gt;               &lt;chr&gt; &lt;dbl&gt;
  1     16   Male    20           1       Q1   Slightly Disagree     0
  2     17   Male    40           1       Q1    Definitely Agree     0
  3     18   Male    33           1       Q1    Definitely Agree     0
  4     19   Male    18           1       Q1    Definitely Agree     0
  5     20   Male    24           1       Q1 Definitely Disagree     0
  6     21 Female    42           1       Q1   Slightly Disagree     0
  7     22 Female    19           1       Q1      Slightly Agree     0
  8     28 Female    49           1       Q1   Slightly Disagree     0
  9     29 Female    17           1       Q1      Slightly Agree     0
  10    31   Male    18           1       Q1      Slightly Agree     0`
  </code></pre>