">(</span><span class="n">fcst_prime</span> <span class="o">*</span> <span class="n">obs_prime</span><span class="p">)</span>
        <span class="n">denominator</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span>
            <span class="n">np</span><span class="o">.</span><span class="n">square</span><span class="p">(</span><span class="n">fcst_prime</span><span class="p">))</span> <span class="o">*</span> <span class="n">np</