title: How to cancel a bias and analyse the data?
body: <p>I have a data table like this one, I would like to know which type of substrate (called &quot;Litières&quot; / &quot;Branchages&quot; / &quot;Racines&quot;) contributes the most to each score.</p>
  <p>in r :</p>
  <pre><code>Substrate&lt;-c('Litières','Litières','Racines','Branchages','Branchages','Litières','Branchages','Litières','Litières' )
  
  One&lt;-c(0,22,216,36,288,351,28,12,0)
  
  Two&lt;-c(574,755,1248,504,882,810,431,537,56)
  
  Three&lt;-c(1352,1248,706,1476,846,855,1334,1152,1628)
  
  Four&lt;-c(261,162,17,171,171,171,394,486,503)
  
  x&lt;-data.frame(Substrate,One,Two,Three,Four)
  </code></pre>
  <p>or in a table :</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th style="text-align: left;">Substrate</th>
  <th style="text-align: center;">One</th>
  <th style="text-align: center;">Two</th>
  <th style="text-align: center;">Three</th>
  <th style="text-align: right;">Four</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td style="text-align: left;">Litières</td>
  <td style="text-align: center;">0</td>
  <td style="text-align: center;">574</td>
  <td style="text-align: center;">1352</td>
  <td style="text-align: right;">261</td>
  </tr>
  <tr>
  <td style="text-align: left;">Litières</td>
  <td style="text-align: center;">22</td>
  <td style="text-align: center;">755</td>
  <td style="text-align: center;">1248</td>
  <td style="text-align: right;">162</td>
  </tr>
  <tr>
  <td style="text-align: left;">Racines</td>
  <td style="text-align: center;">216</td>
  <td style="text-align: center;">1248</td>
  <td style="text-align: center;">706</td>
  <td style="text-align: right;">17</td>
  </tr>
  <tr>
  <td style="text-align: left;">Branchages</td>
  <td style="text-align: center;">36</td>
  <td style="text-align: center;">504</td>
  <td style="text-align: center;">1476</td>
  <td style="text-align: right;">171</td>
  </tr>
  <tr>
  <td style="text-align: left;">Branchages</td>
  <td style="text-align: center;">288</td>
  <td style="text-align: center;">882</td>
  <td style="text-align: center;">846</td>
  <td style="text-align: right;">171</td>
  </tr>
  <tr>
  <td style="text-align: left;">Litières</td>
  <td style="text-align: center;">351</td>
  <td style="text-align: center;">810</td>
  <td style="text-align: center;">855</td>
  <td style="text-align: right;">171</td>
  </tr>
  <tr>
  <td style="text-align: left;">Branchages</td>
  <td style="text-align: center;">28</td>
  <td style="text-align: center;">431</td>
  <td style="text-align: center;">1334</td>
  <td style="text-align: right;">394</td>
  </tr>
  <tr>
  <td style="text-align: left;">Litières</td>
  <td style="text-align: center;">12</td>
  <td style="text-align: center;">537</td>
  <td style="text-align: center;">1152</td>
  <td style="text-align: right;">486</td>
  </tr>
  <tr>
  <td style="text-align: left;">Litières</td>
  <td style="text-align: center;">0</td>
  <td style="text-align: center;">56</td>
  <td style="text-align: center;">1628</td>
  <td style="text-align: right;">503</td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>However you will notice that the number of substrate is not the same between each type of substrate. How to cancel this bias?</p>
  <p>Thank !</p>