1) time to collect data before PR update:

For this time grasp can not be very accurate, just a rough guess, but there is a basis for reality. Based on my observations of several websites, both personally and in the company, I got a deadline for collecting data before PR updates, probably around the middle of February. Most of these pages with a PR of 0 were uploaded or created after the middle of February. This is helpful in proving the deadline for collecting data before PR update. Now, the deadline for collecting data before PR update is roughly known. So, we can assume that the deadline for collecting data before the next PR update will be after the middle of February, and the PR refresh will probably be in the middle of may (since googleguys has hinted at the new algorithm tweaks, the PR refresh will probably be quarterly).

(2) factors affecting PR value (only part of them, of course) :

A: the number of inbound links and the quality of inbound links (PR and number of inbound links, etc.) are well known.
B: the number of pages of a website indexed by Google (which I think is the key factor)

(3) thoughts brought by PR update:

Since the PR value is mainly the same as the number of links and the number of pages included in the decision, then we will be based on these two factors to adjust the site accordingly.
A: we should be very careful when making links. We should never put links in low-quality self-service links (or link farms as most people call them). Not only does this not help improve PR, but you may be penalized for it.
B: in the face of self-service links, you should first look at the quality of the site, the second is the quality of the outgoing links is the number, whether there is a domain name with multiple external repeat links. If so, it proves that this kind of self-help link is not through any nuclear application, extremely dangerous! There are many self-help links similar to the directory, this is the first choice, because the site owner will submit the site through the application, which is a guarantee for you.
C: exchange link strategies:
1, to see whether the linked site has been included by the major search engines and the search engine update frequency (in the search results can see the last dividend update time, if more than three days no update, will not show); If your site is indexed by major search engines and is constantly updated, then your site will also take a lot of light. Because the search engine will also be linked to the site corresponding to the update, then you do not need to pay to the search engine company to help you update (such as "baidu")
2. Whether it is included in a large catalog (such as dmoz,yahoo, etc.); The low PR of such websites is only temporary. After a month, it will take a little longer, and the PR of others will fly up. When you exchange with others, they may not agree.
3. Whether most pages in the website are included; If a website is of good quality and reasonable structure, then such a website is favored by search engines. The number of pages included is proportional to the PR value. Of course, some sites have more than 2,000 pages, while others have more than 80. The latter must be terrible. We look at how many entries are percentages, not Numbers. If the former has hundreds of thousands of pages and only contains over 2,000 pages, this is not a very good site, while the latter has over 80 pages with only 100 pages. Obviously the latter is of much higher quality than the former. Such a site is also an ideal exchange object.
4. Whether I have exchanged links with many similar websites or with many websites (excluding self-help links); This is also a potential factor in the rise in PR, so check out the number of links in the exchange. In particular, the quality of the link is not much.
5, the quality of the site; It is a question of whether a website can be built for a long time if it is of poor quality but has a high PR. Such a site is not the ideal exchange object. Poor website PR will eventually come down, which adds a big factor to the instability of your website PR.
6, the site ranking (refers to the hot keywords); Such a website will not only bring a certain amount of traffic to your site, but also a good partner. Because only high quality website can be placed in the first few places for a long time (generally a month is already a good site).
7. Whether it is the same kind of website; Because in the ranking algorithm, the same kind of website will vote your website rank the higher the score. So that your website is likely to get a better ranking.
Trying to submit to a large catalog gets high-quality backlinks and doesn't cost anything.

D: the relevance of linked sites is particularly important. Generally speaking, when exchanging links, we should consider not only the quality of the other site, but also the relevance. If it is not related to the site, your site ranking and PR impact will not be very big. Therefore, it is suggested that when the exchange of links to choose higher relevance as the first home link, and not related to the site even if the PR again high also can only make secondary page links.
E: the number of outbound links:
Generally one page is kept below 12. This is primarily a commitment to your link partner. High quality web sites are not interested in sites that have dozens of outgoing links on one page, and it also provides a prerequisite for your site to be linked to high PR sites.

F: optimize the internal structure of the website:
Allow search engines to include more pages on your site. Such as: clear site structure, classification clear, clear at a glance; Build navigation bar, link directly with each subcategory; Create a complete sitemap. Don't forget to update the sitemap page as you add pages. Important pages have to be linked to multiple pages in the site, which is why the home page's PR is generally higher than other pages. (I'll discuss this in more detail in the next article)

In addition, or a question is the template page problem, an industry site for the observation. It has a home page of 5 but most secondary or other pages are 0.

Conclusion: in dealing with this major factor that affects the ranking of the site - links, we should be cautious, can not be taken lightly. What is important is to hold to two main respects, namely exterior also link and interior link. Supplement:

Specific methods to improve PR value:
(1) through the message board, you can search in Google "message" and other keywords, the search out of the message board generally have a PR value, and ranked in front of the message board PR value is very high, otherwise it will not be ranked in the front, so you can leave a message in these message board. It's best to leave a comment in a message board that displays a link, so that Google will assume that the PR page already links to your site.
(2) is the exchange of links, although cumbersome but very useful!