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{multi-excerpt:name=UseofBrowsers}The next several sections analyze available statistics for direct use of EVS resources on EVS servers. This section covers direct use of NCI-hosted EVS terminology browsers and the LexEVS local java API that supports them. Later sections cover the LexEVS distributed (remote), LexEVS caGrid services, the term suggestion site, and ftp download services.

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The EVS browsers and LexEVS APIs at NCI are covered by the AWStats and Wusage applications, recording various statistics including number of unique visitors, visits, number of pages viewed and data volume accessed. These have been collected below to give a window into the use of the EVS services. Appendix 1 lists the usage tracking pages from which these statistics are gathered.

While we cannot currently identify and exclude many web crawler and similar hits, detailed examination of addresses and patterns of use suggest that the bulk of use reported below represents real users from NCI and other organizations of interest. Analyzed below are figures for unique visitors and number of visits, as well as the volume of data communicated, which for all but ftp sites reflects high volumes of traffic in mostly compact units of terminology concept data.

h2. Statistical Overview

The EVS browsers run off the LexEVS local API, and provide the highest number of direct users of EVS terminology servers. The lowest, but most informative, numbers are for unique visitors and number of visits. The number of visitors to the EVS family of browsers has averaged between 5,000 and 6,000 per month over the past year, generating a total number of visits of between 13,000 and 17,000 per month.

{color:#002060}{*}Unique visitors to EVS browsers, per month{*}{color}
!BrowserVisitors.JPG|border=1,alt="Chart showing unique visitors to EVS browsers per month"!

{quote}
*Key*
|| Abbreviation || Site ||
| NCITerms | NCI Term Browser (many terminologies, value sets and mappings) |
| NCIt | NCI Thesaurus Browser (now one face of NCITerms, counted separately) |
| NCIm | NCI Metathesaurus Browser (separate app, searchable from NCITerms) |
| TermForm | EVS Term Suggestion site (covered later) |
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{color:#002060}{*}Number of visits to EVS browsers, per month{*}{color} 
!BrowserVisits.JPG|border=1,alt="Chart showing number of visits to EVS browsers per month"!


h2. Browser Users

The EVS browsers see a large volume of usage each month, therefore only one month was chosen for analysis. The data below is from January 2012 through March 2012, the last full month for which we have data. It shows an overall view of which domains hit us most heavily, and then breaks down each domain by top users. All browsers are put together for this analysis as they all use the same API for drawing data and have a similar user base.

h3. Overall Use

The amount of bandwidth used was divided into four (4) major groups: Government .gov users, private .com and .net users, Educational .edu institutions, and Organizations .org. The data was analyzed and bots were discarded to avoid skewing the data.


{color:#002060}{*}Data accessed (MB) from EVS browsers by domain{*}{color}

|| Domain || MB ||
| gov | {align:right}5865{align} |
| edu \\ | {align:right}4312{align} |
| com/ net | {align:right}1239{align} |
| org | {align:right}227{align} |
\\  {color:#002060}{*}Data accessed (MB) from EVS browsers by domain{*}{color}
!BrowserMBbyDomain.JPG|border=1,alt="Chart showing data accessed (MB) from EVS browsers by domain"!

h3. Users from .gov domain

The numbers below show the top government users of the EVS browsers, as measured by the MB of data that were accessed. Agency names have been provided where they are known.  The main users are internal to NCI and NIH, which is not surprising, but we have significant usage from FDA.


{color:#002060}{*}Top .gov EVS browser users: Data accessed (MB)*{color}

|| Organization || MB \\ ||
| NIH-NCI | 4530.38 |
| NIH | 1160.11 |
| FDA | 82.61 |
| California Department of Health Care   Services | 22.00 |
| NIH-OD | 12.03 |
| NIH-NIDDK | 9.19 |
| NIH-NHGRI | 5.95 |
| Social Security Administration | 5.93 |
| NIH-NLM | 5.55 |
| NIH-CIT | 4.64 |
| NIH-NIMH Total | 4.05 |
| NIH-NIDA | 4.01 |
| NIH-OD, Office of Research Services | 3.92 |
| Unknown Total | 3.54 |
| NIH-Clinical Center | 2.96 |
| Government of Alberta, Canada | 2.26 |
| NIH-NEI | 2.01 |
| NIH-NHLBI | 1.59 |
{color:#002060}{*}Top .gov EVS browser users: Data accessed (MB)*{color}
!GovBrowserUsers.JPG|border=1,alt="Chart showing top 10 non-CBIIT .gov EVS browser users: data accessed"!

h3. Users from .com domain

We combined the .net and .com users into one group as both contained a number of private corporations. and individual users from a wide variety of ISPs (labeled as Individual ISPs). Business names have been provided where known.  The graph below does not excludesfully theshow ISPs and Lockheed Martin as they dwarf the next largest group.

{color:#002060}{*}Top .com EVS browser users: Data accessed (MB)*{color}
|| Business || MB ||
| ISP | 526.09 |
| Lockheed Martin | 184.64 |
| Walgreens | 74.32 |
| Johnson and Johnson | 37.63 |
| IBM Rochester | 37.53 |
| Ingenuity Systems | 35.03 |
| Kai Reseach | 29.52 |
| IBM Watson Research Center | 23.41 |
| Booz Allen Hamilton | 21.36 |
| Amgen | 17.55 |
| PAREXEL International | 16.62 |
| Genentech | 16.40 |
| McKesson | 16.28 |
| Virtual Radiologic | 13.82 |
| Bristol-Myers Squibb | 12.77 |
| Roche | 11.88 |
| Intelrad | 10.15 |
| SHARP San Diego Health Care | 10.02 |
| SAIC | 9.77 |
| Intuit | 9.77 |

{color:#002060}{*}Top .com EVS browser users: Data accessed (MB)*{color}
!ComBrowserUsers.JPG|border=1,alt="Chart showing top .com EVS browser users: Data accessed"!

h3. Users from .edu domain

The edu users were widely distributed across many American universities and a small selection of foreign institutions.

{color:#002060}{*}Top .edu EVS browser users: Data accessed (MB)*{color}

|| Institution || MB ||
| University of   GeorgiaMayo Clinic | 22649.9243 |
| San ArizonaDiego CancerSupercomputer Center | 31441.1446 |
| University of PittsburghWisconsin | 360.5054 |
| Washington MD Anderson Cancer Center - University of in St. LouisTexas | 320.7366 |
| JohnsVanderbilt Hopkins MedicineUniversity | 412.0194 |
| Harvard University |of 4.09 |
| UniversityWisconsin College of Pittsburgh Medical CenterEngineering | 410.4481 |
| NovaUniversity Southeasternof UniversityUtah | 59.0356 |
| Duke University University of California, San Diego | 59.0452 |
| University of California,Nebraska SanMedical FranciscoUniversity | 59.0624 |
| University of Chicago | 5.75 |
| University of NebraskaCalifornia, MedicalSan UniversityFrancisco | 95.2406 |
| Duke University of California, San Diego | 95.5204 |
| UniversityNova ofSoutheastern UtahUniversity | 95.5603 |
| University of WisconsinPittsburgh CollegeMedical ofCenter   Engineering | 104.8144 |
| VanderbiltHarvard University | 124.9409 |
| MD Anderson Cancer Center -Johns Hopkins Medicine | 4.01 |
| Washington University ofin St.  TexasLouis | 203.6673 |
| University of WisconsinPittsburgh | 603.5450 |
| SanArizona DiegoCancer Supercomputer Center | 14413.4614 |
| MayoUniversity of ClinicGeorgia | 26492.4392 |
{color:#002060}{*}Top .edu EVS browser users: Data accessed (MB) \[Mayo truncated\]*{color}
!EduBrowserUsers.JPG|border=1,alt="Chart showing top 10 .edu EVS browser users: Data accessed (MB) Mayo truncated"!

h3. Users from .org domain

Like the .edu users, the .org users were widely distributed across a variety of organizations.

{color:#002060}{*}Top .org EVS browser users: Data accessed (MB)*{color}

|| Organization || MB ||
| Partners HealthCare | 36.76 |
| caphealth.org | 24.50 |
| Unknown | 21.59 |
| Fred Hutchinson Cancer Research Center | 21.02 |
| The National Marrow Donor Program | 17.07 |
| American College of Cardiology | 16.42 |
| Cleveland Clinic | 16.10 |
| Sloan-Kettering | 13.05 |
| Hendrick Medical Center | 7.76 |
| Alfred Mann Foundation | 7.41 |
| The MITRE Corporation | 6.56 |
| The Jackson Laboratory | 5.41 |
| Montefiore Medical Center | 3.30 |
| Lifepath Hospice | 2.91 |
| UHS | 2.47 |
| Sherman Hospital | 2.44 |
| Trinity Health - Catholic Health Care   System | 2.28 |
| Red de Entretenimiento en Espanol SA | 1.89 |
| Cancer Care, Inc. | 1.88 |
| RTI International | 1.87 |
{color:#002060}{*}Top .org EVS browser users: Data accessed (MB)*{color}
!OrgBrowserUsers.JPG|border=1,alt="Chart showing top 10 .org EVS browser users: data accessed"!
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