The document discusses various factors that may influence search engine rankings according to a 2015 survey from Moz. It separates these factors into those related to the domain level, including domain name features, link authority, keyword usage, and brand metrics. It also separates page-level factors such as social metrics, link metrics, keyword usage, agnostic features, and user usage metrics. Each category of factors is rated on a scale from 1 to 10 on potential influence on search engine rankings.

1. The Future of SEO: 2015 Ranking
Factors survey
(source moz.com)

2. Domain Related SEO Features:
• Domain-Level, Keyword-Agnostic Features: Domain
name length, TLD extension, SSL certificate, etc.
• Domain-Level, Link Authority Features: Based on
link/citation metrics such as quantity of links, trust,
domain-level PageRank, etc.
• Domain-Level Keyword Usage: Exact-match keyword
domains, partial-keyword matches, etc.
• Domain-Level Brand Metrics: Offline usage of
brand/domain name, mentions of brand/domain in
news/media/press, toolbar/browser data of usage
about the site, entity association, etc.

3. • Page-Level Social Metrics: Quantity/quality of tweeted
links, Facebook shares, Google +1s, etc. to the page
• Page-Level Link Metrics: PageRank, Trust metrics,
quantity of linking root domains, links, anchor text
distribution, quality/spamminess of linking sources, etc.
• Page-Level Keyword & Content-Based Metrics: Content
relevance scoring, on-page optimization of keyword
usage, topic-modeling algorithm scores on content,
content quantity/quality/relevance, etc.
• User Usage & Traffic/Query: Data SERP engagement
metrics, clickstream data, Visitor traffic/usage signals,
quantity/diversity/CTR of queries, both on the domain
and page level
• Page-Level, Keyword-Agnostic Features: Content length,
readability, Open Graph markup, uniqueness, load speed,
structured data markup, HTTPS, etc.

4. Page-Level Keyword Usage Features:
These features describe use of the keyword term/phrase in particular parts
of the HTML code on the page (title element, H1s, alt attributes, etc).
Rated on a scale from 1 (no direct influence) to 10 (strong influence).

5. Page-Level Keyword Agnostic Features:
These elements describe non-keyword-usage, non-link-metrics features of
individual pages (such as length of the page, load speed, etc.).
Rated on a scale from 1 (no direct influence) to 10 (strong influence).

8. Page-Level Link-Based Features
These features describe link metrics to the individual ranking
page (such as number of links, PageRank, etc.)
Rated on a scale from 1 (no direct influence) to 10 (strong
influence).

10. Page-Level Social Metrics
These features relate to third-party
metrics from social media sources
(Facebook, Twitter, Google+, etc.) for
the ranking page.
Rated on a scale from 1 (no direct
influence) to 10 (strong influence).

13. Domain-Level Keyword Usage Features:
These features cover how keywords are
used in the root or subdomain name, and
how much impact this might have on
search engine rankings.
Rated on a scale from 1 (no direct
influence) to 10 (strong influence).

15. Domain-Level Brand Metrics
These features describe elements that
indicate qualities of branding and
brand metrics.
Rated on a scale from 1 (no direct
influence) to 10 (strong influence).

17. Domain-Level Link-Authority
Features:
These features describe link metrics
about the domain hosting the page.
Rated on a scale from 1 (no direct
influence) to 10 (strong influence).