Only outgoing (internal or external) links are being involved in the PageRank calculation.
Actually in page named anchors may help your SEO by constructing named links in SERP. Have a look here.
Rel="nofollow" should not be used for PageRank sculpting. When you
nofollow to a link, like in your example, you actually
say to search engines that this link cannot be trusted.
Rel="nofollow" does not exclude a link from the PageRank calculation, but it only says to bots, not to follow this link and don't pass anchortext.
For example, on a page you have 10 (internal external there is no difference) links, and let says there is 50 PageRank juice for this page.
To calculate how much juice each link gets, we have to divide the total juice with the total amount of links, in this example 50 / 10 = 5 juice per link.
If all links are followed, all your links will get 5 juice.
If you nofollow 2 of them, the total juice that each link gets is not changed. So you will have 8 links with 5 juice and 2 links with 0 juice.
This is not happening:
50 / (total links - nofollowed) = 50 / 8 = 6.25 juice per link.
To sum up, when you nofollow a link it doesnt remove it from the PageRank calculation.
You can find more information here.