//  Task 1: routine setup
    
    capture log close // close log file if one is open
    set more off // tells Stata not to pause or display the --more-- message
    estimates clear // drop all stored estimation results
    
    log using cda01b-ex1.log, replace text
    version 9.2
    set scheme s2mono // scheme for graphs
    
//  pgm:        cda01b-ex1.do
//  task:       1 - Introduction to Stata - Excercise
//  project:    CDA Lab Guide
//  author:     your name
//  date:       today's date

    use nes2.dta, clear

//  Task 2: Keep abortion, age, didvote, fincome, partyid and preclin.
//  Explore these variables and drop missing cases.

//  Step 2.1 keep the 6 variables.

//  Step 2.2 explore your variables using -desc- -tab- and -dotplot-

//  Step 2.3 drop missing cases


//  Task 3: Generate partyaff based on partyid.
//
//      If partyid is strong democrat or weak democrat, partyaff is 1.
//      If partyid is any type of independents, partyaff is 2.
//      If partyid is any type of Republican, partyaff is 3.
//      Recode other parties as missing; drop cases if partyaff is missing.
//
//  Add labels to partyaff. Verify your steps.

//  Step 3.1 generate partyaff from partyid.

//  Step 3.2 recode partyaff and drop missing cases.
//
//      partyaff=1 if partyid is 0 or 1
//      partyaff=2 if partyid is 2 or 3 or 4
//      partyaff=3 if partyid is 5 or 6
//      partyaff=missing if partyid is 7

//  Step 3.3 label variable and label values

//  Step 3.4 verify your results


//  Task 4: Generate vote from didvote.
//
//      If didvote=1, then vote=1
//      If didvote=5, then vote=0
//      If didvote=6, then vote=.
//
//  Add labels and verify your transformation.

//  Step 4.1 generate vote from didvote

//  Step 4.2 recode vote and drop the missing cases.

//  Step 4.3 add variable and value labels.

//  Step 4.4 verify


//  Task 5 Generate income from fincome. Then recode income in $1000s by
//  choosing the midpoint of each category of fincome. For the highest
//  category, >105k, multiply that number by 1.5. Make 66 (below 25K but NA)
//  and 77 (above 25K but NA) missing. Label and verify your transformation.

//  Step 5.1 create income from fincome

//  Step 5.2 recode income into $1000 using midpoints.

//  Step 5.3 label variable income

//  Step 5.4 verify


//  Task 6 [Optional]: First, create three dummy variables.
//
//      democrat=1 if partyaff=1, else 0.
//      indep=1 if partyaff=2, else 0.
//      republican=1 if partyaff=3, else 0.
//
//  Add labels.
//  Run an OLS regression of vote on age, income, indep & republican.
//  Run a logit of vote vote on age, income, indep & republican.
//  Compare results.

//  Step 6.1 create the dummy variables. Note that missing don't change.

//  Step 6.2 add labels and verify  


//  Task 7 Run OLS and logit regressions and get coefficients using listcoef

//  Step 7.1 run OLS of vote on age, income, indep and republican.

//  Step 7.2 use listcoef to list coefficients

//  Step 7.3 run logit for same variables.

//  Step 7.4 use listcoef to list coefficients


//  Task 8: Save the new variables in a new data set.
//  Create a summary table of the variables and close the log file.

//  Step 8.1 save the data

//  Step 8.2 descriptive statistics

//  Step 8.3 close log file

    log close
    exit