Geoearch / Live Stats / Bug Report / FAQ / About LinkedCT

Is LinkedCT's data Open?

We believe it is! The data is made available under Creative Commons Attribution-Noncommercial-Share Alike 2.5 Canada License, which means you are free to:
 
  • Share — to copy, distribute and transmit the work
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  • Remix — to adapt the work
  • Under the following conditions:
     
  • Attribution — You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
  •  
  • Noncommercial — You may not use this work for commercial purposes.
  •  
  • Share Alike — If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar licence to this one.
  • With the understanding that: permissions beyond the scope of this public license are available at http://www.clinicaltrials.gov/ct2/info/terms.

    Refer to this page for more details.

    How up-to-date is the data?

    A script is always running in the background to keep the data fresh. However, this doesn't mean that the data is up-to-date at all times. There might be a delay until our system gets notified about new trials or changes in the old trials. This delay might be a few seconds or a few days (or even weeks). On average, it will take less than a day for the new trials to show up, but the update process might be slower simply because it takes longer to identify a change, but we can instantly find out if there are new trials made available on ClinicalTrials.gov.

    What happened to the (old) static LinkedCT?

    It is still available, for a limited time, at http://static.linkedct.org. You can always download previous data dumps here.

    Can I download all the data?

    You can only download static data dumps made available here. We will do our best to have a new dump every three months.

    I have been issuing a lot of queries to LinkedCT's server, but now I cannot access the server anymore. What is wrong?

    We have a small server hosting a large amount of data. We expect the users to issue queries responsibly, otherwise we unfortunately have to block their IP addresses. If you think we have blocked your IP address by mistake, send us an email and we will fix it. Please have in mind that the project is still in its preview phase and we might have short, temporary down times. Contact us only if the data is not accessible for a long period of time (say a few hours).

    If you need to issue a lot of (expensive) queries in your application, we highly recommend that you download the latest data dump and load it onto your own local triplestore.

    If you really need the live databrowse interface and SPARQL endpoint for regular use and possibly expensive queries, and you can afford to pay for a virtual server, drop us an email and we might be able to set up a custom more powerful server for you.

    Is the SPARQL endpoint working properly?

    Please see Issue #2. Richard Boyce from University of Pittsburgh has kindly provided an extra SPARQL endpoint powered by OpenLink Virtuoso.