+ Reply to Thread
Results 1 to 2 of 2

Thread: my assignment due tomorrw,please help me

  1. #1
    Points: 4,984, Level: 45
    Level completed: 17%, Points required for next Level: 166

    Posts
    1
    Thanks
    0
    Thanked 0 Times in 0 Posts

    my assignment due tomorrw,please help me




    Dear Sir or Madam,
    I would appreaciate your efforts to help others,so please help me in my assignment which is due tomorrow :


    In a cohort study of HIV-infected individuals initiating antiretroviral therapy, the
    following variables are measured at baseline:

    • X1 = plasma viral load (continuous variable)
    • X2 = history of injection drug use (frequent/occasional/never)
    • X3 = number of years of formal education (starting from Grade 1).
    The outcome variable is:
    • Y = plasma viral load after 12 months of therapy (continuous variable).

    For parts (a) through (e), write down the conditional mean equation (eg., µY |X1 ,X2 =
    b0 + b1X1 + b2X2) that corresponds to the given problem. For history of injection drug
    use, identify the dummy coding you are using for each category.
    (a) A model for predicting Y using only the baseline plasma viral load.
    (b) A model for predicting Y using only the history of injection drug use.
    (c) A model for predicting Y using history of injection drug use and years of formal
    education assuming no e ect modification.
    (d) A mo del for predicting Y using the history of injection drug use and years of
    formal education and allowing for the relationship between Y and years of formal
    education to be di erent for each category of drug use.
    (e) A model for predicting Y using all predictor variables by themselves and allowing
    for e ect modification between baseline plasma viral load and years of formal
    education.
    (f) Describe the procedure that you would use to conduct a test of the hypothesis
    that the slope of the relationship between Y and years of formal education is the
    same across categories of drug use. That is, identify which models you would fit,
    the quantities you need from fitting these models, the calculation used to obtain
    the test statistic for testing this hypothesis, and the critical value to which the
    test statistic would be compared.


    Thank you
    Last edited by yoshaa; 10-17-2005 at 01:26 PM.

  2. #2
    TS Contributor
    Points: 17,636, Level: 84
    Level completed: 58%, Points required for next Level: 214
    JohnM's Avatar
    Posts
    1,948
    Thanks
    0
    Thanked 6 Times in 5 Posts

    yoshaa,

    Thank you very much for visiting and using our services, however, we'll need to see what you've attempted so far and any specific questions you may have.

    We're happy to help, but unfortunately we're not a "homework doing" service.

    JohnM

+ Reply to Thread

           




Similar Threads

  1. Assignment
    By woozi in forum Statistics
    Replies: 2
    Last Post: 11-24-2010, 12:31 PM
  2. help me in assignment plz
    By kashif87 in forum Probability
    Replies: 2
    Last Post: 06-11-2009, 06:02 AM
  3. Help with an assignment
    By trd in forum Statistics
    Replies: 0
    Last Post: 03-01-2008, 03:04 PM
  4. Almost done with assignment but . . .
    By vonbaxter in forum Statistics
    Replies: 1
    Last Post: 04-23-2007, 01:17 PM
  5. Need help with this assignment.
    By winston waldron in forum Probability
    Replies: 0
    Last Post: 08-25-2006, 11:32 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