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h1. {page-info:title}

{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.


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}

|| 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) |

{color:#002060}{*}Number of visits to EVS browsers, per month{*}{color} 

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 December 2011, 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 ||
| orggov | {align:right}592605{align} |
| edu com/ net \\ | {align:right}141200{align} |
| com/ net \\ edu | {align:right}200141{align} |
| govorg | {align:right}260559{align} |
\\  {color:#002060}{*}Data accessed (MB) from EVS browsers by domain{*}{color}

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.

{color:#002060}{*}Top 10 non-CBIIT .gov EVS browser users: Data accessed (MB)*{color}

|| Organization || MB ||
| NIH-NINRNCI | {align:right}12350{align} |
| NIH-NIDACIT | {align:right}173{align} |
| NIH-NICHDFDA | {align:right}132{align} |
| NIH-NIAMSNHLBI | {align:right}23{align} |
| NIH-NHGRIOD | {align:right}2{align} |
| NIH-ODNHGRI | {align:right}2{align} |
| NIH-NHLBINIAMS | {align:right}32{align} |
| FDANIH-NICHD | {align:right}321{align} |
| NIH-CITNIDA | {align:right}731{align} |
| NIH-NCININR | {align:right}23501{align} |

{color:#002060}{*}Top 10 non-CBIIT .gov EVS browser users: Data accessed (MB)*{color}

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.

{color:#002060}{*}Top 10 .com EVS browser users: Data accessed (MB)*{color}

|| Business || MB ||
| GenentechIndividual ISPs | {align:right}393{align} |
| SAICIngenuity Systems | {align:right}318{align} |
| Lockheed WalgreensMartin | {align:right}416{align} |
| Epocrates Eli Lilly and Company | {align:right}610{align} |
| Booz Allen PrevagenHamilton | {align:right}7{align} |
| Booz AllenPrevagen Hamilton | {align:right}7{align} |
| Eli Lilly and Company Epocrates | {align:right}106{align} |
| LockheedWalgreens Martin | {align:right}164{align} |
| Ingenuity SystemsSAIC | {align:right}183{align} |
| IndividualGenentech ISPs | {align:right}933{align} |

{color:#002060}{*}Top 10 .com EVS browser users: Data accessed (MB)*{color}

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 10 .edu EVS browser users: Data accessed (MB)*{color}

|| Institution || MB ||
| OhioSan State   University MedicalDiego Supercomputer Center | {align:right}153{align} |
| UniversityMayo of Michigan Health System Clinic | {align:right}142{align} |
| Columbia University ofMedical MinnesotaCenter | {align:right}28{align} |
| University of Pittsburgh Medical CenterUtah | {align:right}27{align} |
| University of Southern CaliforniaVanderbilt University | {align:right}46{align} |
| University of VanderbiltSouthern UniversityCalifornia | {align:right}64{align} |
| University of UtahPittsburgh Medical Center | {align:right}72{align} |
| Columbia University Medicalof CenterMinnesota | {align:right}82{align} |
| Mayo Clinic University of Michigan Health System | {align:right}421{align} |
| Ohio State  San DiegoUniversity SupercomputerMedical Center | {align:right}531{align} |

{color:#002060}{*}Top 10 .edu EVS browser users: Data accessed (MB) \[Mayo truncated\]*{color}

h3. Users from .org domain

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

{color:#002060}{*}Top 10 .org EVS browser users: Data accessed (MB)*{color}

|| Organization || MB ||
| GundersenPartners Lutheran   Health System HealthCare | {align:right}116{align} |
| AmericanRTI CollegeInternational of Cardiology | {align:right}27{align} |
| BroadFred InstituteHutchinson ofCancer MITResearch and HarvardCenter | {align:right}35{align} |
| The National GynecologicMarrow OncologyDonor GroupProgram | {align:right}34{align} |
| Bioanalysis Sloan-KetteringInstitutes - U.S. Army | {align:right}4{align} |
| Bioanalysis Institutes - U.S. Army Sloan-Kettering | {align:right}4{align} |
| TheGynecologic National Marrow Donor ProgramOncology Group | {align:right}43{align} |
| Broad FredInstitute Hutchinsonof CancerMIT Researchand CenterHarvard | {align:right}53{align} |
| RTI InternationalAmerican College of Cardiology | {align:right}72{align} |
| Partners HealthCare Gundersen Lutheran   Health System | {align:right}161{align} |

{color:#002060}{*}Top 10 .org EVS browser users: Data accessed (MB)*{color}