Calculating Similarities: Similarity Score

Next, for each pair of genes, we multiply the values from each sample, add up the products, and divide by the number of samples (5). This operation is known as the dot product in vector algebra. The result is the similarity score. For example, for Gene A and Gene B, you have:

The normalized values and the similarity score for Genes A and B
Gene A Gene B Product
Sample 1 1.166744 0.099756 0.116389
Sample 2 −0.01659 −0.39902 0.00662
Sample 3 0.938726 1.649106 1.548059
Sample 4 −0.50801 −1.4496 0.736406
Sample 5 −1.58087 0.099756 −0.1577
Sum 2.249774
Similarity Score 0.449955