+ Reply to Thread
Results 1 to 14 of 14

Thread: How to get this number?

  1. #1
    Points: 1,334, Level: 20
    Level completed: 34%, Points required for next Level: 66

    Posts
    11
    Thanks
    0
    Thanked 0 Times in 0 Posts

    How to get this number?





    a) Variant
    P(x=0)=P(0,0)+P(0,1)+P(0,2)=0.27
    P(x=1)=P(1,0)+P(1,1)+P(1,2)=0,4
    P(x=2)=P(2,0)+P(2,1)+P(2,2)=0.33
    expected value ( I do not know how to get this?)
    E(x)=0,(27)+1,(4)+2(33)=....
    Last edited by Aauusteja; 11-22-2010 at 02:33 PM.

  2. #2
    Points: 3,024, Level: 33
    Level completed: 83%, Points required for next Level: 26
    SmoothJohn's Avatar
    Location
    Edmonton, Canada
    Posts
    165
    Thanks
    11
    Thanked 12 Times in 10 Posts

    Re: HOw to get this number?

    Is something missing here? The top equation does add up correctly. There follows a bunch of white space an an unrelated calculation.

    John

  3. #3
    Devorador de queso
    Points: 95,540, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Awards:
    Posting AwardCommunity AwardDiscussion EnderFrequent Poster
    Dason's Avatar
    Location
    Tampa, FL
    Posts
    12,930
    Thanks
    307
    Thanked 2,629 Times in 2,245 Posts

    Re: HOw to get this number?

    Yeah. You really don't specify what's giving you problems.

  4. #4
    Points: 1,334, Level: 20
    Level completed: 34%, Points required for next Level: 66

    Posts
    11
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: HOw to get this number?

    Quote Originally Posted by Dason View Post
    Yeah. You really don't specify what's giving you problems.
    I correct it...

  5. #5
    Points: 3,024, Level: 33
    Level completed: 83%, Points required for next Level: 26
    SmoothJohn's Avatar
    Location
    Edmonton, Canada
    Posts
    165
    Thanks
    11
    Thanked 12 Times in 10 Posts

    Re: HOw to get this number?

    Ok, I think I know what is confusing you. (In your initial post, you seemed troubled that your calculated expected value was greater than one. Is that the problem?)

    After you calculate the expected value, what is it that you know? Or to put it another way, what does the expected value tell you?

  6. #6
    Points: 1,334, Level: 20
    Level completed: 34%, Points required for next Level: 66

    Posts
    11
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: HOw to get this number?

    I do not know how to calculate it ( how to find) expected value.

  7. #7
    Points: 1,334, Level: 20
    Level completed: 34%, Points required for next Level: 66

    Posts
    11
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: How to get this number?

    Noone do not want to help...

  8. #8
    Points: 3,024, Level: 33
    Level completed: 83%, Points required for next Level: 26
    SmoothJohn's Avatar
    Location
    Edmonton, Canada
    Posts
    165
    Thanks
    11
    Thanked 12 Times in 10 Posts

    Re: How to get this number?

    Why are you suspicious of your calculation? That's why I was asking my questions. The answer is right under your nose

  9. #9
    Points: 1,334, Level: 20
    Level completed: 34%, Points required for next Level: 66

    Posts
    11
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: How to get this number?

    E(x)=0,(27)+1,(4)+2,(33)=27/99+13/9+21/9=401/99
    It's okay?
    Last edited by Aauusteja; 11-23-2010 at 12:49 PM.

  10. #10
    Points: 3,024, Level: 33
    Level completed: 83%, Points required for next Level: 26
    SmoothJohn's Avatar
    Location
    Edmonton, Canada
    Posts
    165
    Thanks
    11
    Thanked 12 Times in 10 Posts

    Re: How to get this number?

    Your notation indicates that you are mixing up two systems. I'll write my answer in the North American English fashion.


    E(x)=0*(0.27)+1*(0.4)+2*(0.33)=1.06

    The idea is that you expect to have 0 sales 27% of the time, 1 sale 40% of the time and 2 sales 33% of the time. For a randomly selected period, you expect 1.06 sales.

  11. #11
    Points: 1,334, Level: 20
    Level completed: 34%, Points required for next Level: 66

    Posts
    11
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Lightbulb Re: How to get this number?

    Thanks, you realy helped me.
    But one more question
    Define the chance variable H as the total sales on markets X and Y
    How that will look?
    P(x,y)=P(1,1)+P(1,2)+P(2,1)+P(2,2)

  12. #12
    Points: 3,024, Level: 33
    Level completed: 83%, Points required for next Level: 26
    SmoothJohn's Avatar
    Location
    Edmonton, Canada
    Posts
    165
    Thanks
    11
    Thanked 12 Times in 10 Posts

    Re: How to get this number?

    That isn't a question; it's telling you what H stands for.

    Now that I look again, is the posted table complete? or is some information missing?

  13. #13
    Points: 1,334, Level: 20
    Level completed: 34%, Points required for next Level: 66

    Posts
    11
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: How to get this number?

    It's all, nothing isn't missing.

  14. #14
    Points: 1,334, Level: 20
    Level completed: 34%, Points required for next Level: 66

    Posts
    11
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: How to get this number?


    If I good understand
    I need to define H e.g all goods sould be sold
    So P(x,y)=P(1,1)+P(1,2)+P(2,1)+P(2,2) Can be like this?

+ Reply to Thread

           




Similar Threads

  1. AIC number of parameter
    By Rigal@mnhn.fr in forum Regression Analysis
    Replies: 0
    Last Post: 01-23-2011, 07:31 PM
  2. Number of IVs for Mahalanobis
    By stephonomon in forum Statistical Research
    Replies: 0
    Last Post: 04-17-2010, 08:33 PM
  3. Number of bit combinations
    By Whalojazz in forum Probability
    Replies: 3
    Last Post: 07-01-2009, 08:12 AM
  4. Number of samples?
    By djrh in forum Statistics
    Replies: 1
    Last Post: 03-05-2009, 08:42 AM
  5. Max number in a period
    By Rodrigo Santos in forum Statistics
    Replies: 0
    Last Post: 02-07-2008, 05:48 PM

Posting Permissions

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






Advertise on Talk Stats