+ Reply to Thread
Results 1 to 3 of 3

How do I put days of the week into a multiple regression model?

  1. #1
    Paula
    Guest

    How do I put days of the week into a multiple regression model?

    I am building a multiple linear regression model to predict peak power demant
    using maximum daily temerature (in degrees) and the day of the week as
    independent variables. I am unsure how to code the days of the week in order
    to get the result I want. (when I use the days - the regression add-in tool
    states that I'm not using the correct type of data, its non-numeric). I
    believe this model will have 7 seperate independent variables, but am unsure
    on how to get there.

  2. #2
    Ron Rosenfeld
    Guest

    Re: How do I put days of the week into a multiple regression model?

    On Sun, 5 Feb 2006 15:43:26 -0800, "Paula" <[email protected]>
    wrote:

    >I am building a multiple linear regression model to predict peak power demant
    >using maximum daily temerature (in degrees) and the day of the week as
    >independent variables. I am unsure how to code the days of the week in order
    >to get the result I want. (when I use the days - the regression add-in tool
    >states that I'm not using the correct type of data, its non-numeric). I
    >believe this model will have 7 seperate independent variables, but am unsure
    >on how to get there.


    Sunday = 1
    Monday = 2

    etc.

    or, if you have actual dates, use the WEEKDAY worksheet function.


    --ron

  3. #3
    Forum Expert
    Join Date
    09-09-2005
    Location
    England
    MS-Off Ver
    2007
    Posts
    1,500
    If I understand correctly coding Monday to 1, Tuesday to 2 etc will create one variable for days of the week and assume that tuesday is double monday! I don't think this is what you want.

    You need to create 7 variables
    One for each day eg 1 if monday 0 if not as one variable, 1 if tuesday 0 if not etc. Although arguably you could get way with six variables as if it is not mon-sat it has to be sunday!
    day mon tue wed thu fri sat sun
    Monday,1,0,0,0,0,0,0
    Tuesday,0,1,0,0,0,0,0
    Wednesday,0,0,1,0,0,0,0
    Thursday,0,0,0,1,0,0,0
    Friday,0,0,0,0,1,0,0
    Saturday,0,0,0,0,0,1,0
    Sunday,0,0,0,0,0,0,1


    Regards
    Dav

+ Reply to Thread

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Search Engine Friendly URLs by vBSEO 3.6.0 RC 1