an>(obs_homa,<span class="dt">select =</span> <span class="op">-</span><span class="kw">c</span>(obs_ID))</a>
<a class="sourceLine" id="cb2-6" title="6"><span class="co"># For each observation, we need the individual plant fitness and the number of neighbours per species (in columns).</span></a>
<a class="sourceLine" id="cb2-7" title="7"><span class="kw">head</span>(obs_homa)</a></code></pre></div>
<pre><code>##   fitness BEMA CETE CHFU CHMI HOMA LEMA MEEL MESU PAIN PLCO POMA POMO PUPA
## 1      12    2    