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#1278 ✓stale

calculations for stddev will always return a float value

Reported by aka47 | October 27th, 2008 @ 12:50 PM | in 3.x

In 99% of all standard deviation calculations you want the return value to be a float value, until now it depends on the value of the column you calculate the Standard deviation for. The standard deviation of a integer field will be an integer as well.

I changed it so it will always be a float, also for stddev_pop and stddev_samp

I also added it to the documentation

Comments and changes to this ticket

  • Pratik

    Pratik March 6th, 2009 @ 04:19 PM

    • Assigned user set to “Pratik”

    Looks good. I wonder how many DBs support stddev ? If it works on mysql/postgres/sqlite, I'd be happy to commit.


  • Pratik

    Pratik May 18th, 2009 @ 10:22 PM

    • State changed from “new” to “incomplete”

    Doesn't work on sqlite3.

  • Jeremy Kemper

    Jeremy Kemper May 4th, 2010 @ 06:48 PM

    • Milestone changed from 2.x to 3.x
  • Santiago Pastorino

    Santiago Pastorino February 2nd, 2011 @ 05:04 PM

    • State changed from “incomplete” to “open”
    • Importance changed from “” to “”

    This issue has been automatically marked as stale because it has not been commented on for at least three months.

    The resources of the Rails core team are limited, and so we are asking for your help. If you can still reproduce this error on the 3-0-stable branch or on master, please reply with all of the information you have about it and add "[state:open]" to your comment. This will reopen the ticket for review. Likewise, if you feel that this is a very important feature for Rails to include, please reply with your explanation so we can consider it.

    Thank you for all your contributions, and we hope you will understand this step to focus our efforts where they are most helpful.

  • Santiago Pastorino

    Santiago Pastorino February 2nd, 2011 @ 05:04 PM

    • State changed from “open” to “stale”

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