Defining Search Metrics: Search Engine Saturation

In my last articles about search engine metrics, I defined search engine presence as "the number of times a site shows across the search engines for a selected set of keywords". Next, I defined, explained and showed an example of search engine fluctuation as "the natural fluctuation of presence of the same selected set of keywords over time".

This time, I want to talk about the two types of search engine saturation. I'd like to defne search engine saturation as essentially "presence over the total data size". In statistics, the data size is represented by the variable "n". If the data size is a dozen eggs, then n=12. The data size of states in the US is n=50. In this case, we're measuring results over three search engines. "SE" = 3. If we included Ask.com in the results, SE would equal 4. However, at this point, we're only measuring 3 search engines, Google, MSN and Yahoo!.

The next part is the total number of results tallied. Since we're measuring the top 15 ranks in Google, the top 10 in MSN and Yahoo!. With this information, we can calculate the total data size for any data capture.

n= (# of keywords) * (15 Google + 10 MSN + 10 Yahoo!).

in this case:

n= (3)*(35) = 105

To calculate the saturation, you divide each presence by "n" to get the percentage of the search engines the site occupies as a function of the entire marketspace.

Domains	SE Presence	SE Presence	SE Saturation	AVG Saturation
www.apple.com	7	17	16.19%	11.43%
www.engadget.com	7	9	8.57%	7.62%
en.wikipedia.org	4	7	6.67%	5.24%
www.gizmodo.com	6	6	5.71%	5.71%
www.appleinsider.com	5	4	3.81%	4.29%
www.mobilewhack.com	5	4	3.81%	4.29%
www.thinksecret.com	7	3	2.86%	4.76%
news.bbc.co.uk	4	3	2.86%	3.33%
www.businessweek.com	3	3	2.86%	2.86%
appleiphone.blogspot.com	0	3	2.86%	1.43%
www.macworld.com	1	3	2.86%	1.90%
www.everythingiphone.com	5	2	1.90%	3.33%
gizmodo.com	4	1	0.95%	2.38%

Apple.com has a presence of 17, and divided by 105, the search engine saturation equals 16.19%, which represents the market share of the marketspace. This number will fluctuate as the results fluctuate. The saturation measurement is useful as a snapshot of the search engine space and a result of your campaign. However, what's really important is the trend of data. You want your presence to rise and you will want your average saturation to rise as well. The average saturation measures the health of the life of the campaign as the raw numbers of the presence fluctuate. In essence, it's a measurement that you can measure and quantify to see if you're doing well, or if you're trending down.

Each of these metrics have value in and of themselves, however, when taken as a whole, they start to give you a clearer picture of the life of the natural search campaign.