//  Task 1 routine setup
 
    capture log close 
    set more off 
    estimates clear 
   
    log using cda07b-ex7.log, replace text
    version 9.2
    set scheme s2mono 
    
//  pgm:        cda07b-ex7.do
//  task:       7 - Nominal Outcomes - Excercise
//  project:    CDA Lab Guide
//  author:     your name
//  date:       today's date

    use sci-review, clear

//  Task 2: Estimate an MNLM of jobclass on female, enrol, and phd. List the
//  output from listcoef, help.


//  Task 3: Compute the discrete change coefficients with prchange with all
//  variables held at their mean. Verify the results with prvalue.

//  Task 3a: use prchange to compute the discrete changes and marginal
//  effects when all variables are held at their means.


//  Task 3b: for one of the variables, verify the computed value of the discrete
//  change using prvalue.


//  Task 3c: use listcoef to list the coefficients for phd.


//  Task 3d: interpret the effect of phd on jobclass using odds ratio
//  coefficients.

/*  Type your answer here

*/

//  Task 3e: use listcoef to list the coefficients for all variables


//  Task 3f: use mlogview to plot the odds coefficients and discrete changes.

//  use prchange to set the starting values for mlogview/mlogplot; here I set
//  the base values to be the mean values of all independent variables.


//  odds ratio coefficients for phd only


//  discrete changes for female, with standardized coefficients for enroll
//  and unstandardized for phd.


//  add discrete changes


//  Task 3g: interpret the effects using odds ratio coefficients.

/*  Type your answer here

    **  female

    **  enroll

    **  and so on...
*/

//  Task 4: Test the effects of each variable and of whether dependent
//  categories can be combined.

//  Task 4a: estimate the MNLM of jobclass on female, enrol, and phd.


//  Task 4b: use mlogtest to compute LR tests for each variable.


//  Task 4c: write up the results of the test for phd.

/*  Type your answer here

*/

//  Task 4d: use mlogtest to compute LR tests that categories can be combined.


//  Task 4e: write up your conclusions regarding combining categories.

/*  Type your answer here

*/

//  SHOW AND TELL: Here is what I'd like you to turn in for a model
//  that you find interesting.

    use sci_review, clear
    mlogit jobclass female enrol phd, basecategory(4) nolog
    tab jobclass // turn this in
    desc female enrol phd // turn this in
    sum female enrol phd // turn this in
    prchange // don't turn this in
    mlogplot phd, std(u) p(.1) or ntics(9) // turn in
        graph export cda07b-ex7-showandtell1.emf, replace
    mlogplot female enrol phd, std(0uu) p(.1) or dc ntics(9)
        graph export cda07b-ex7-showandtell2.emf, replace

log close