* 10nov99 revision

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* Log file
* NOTE:  Path to .log file should be modified as needed.
log using c:\!docs\S210a\condl2.log

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* Log file:  condl2.log
* Do file:  condl2.do    
* 10nov99 revision by McFarland

* Crosstabs for discussion of joint, conditional, and
* marginal probabilities, and independence.

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* Data
* NOTE:  Path to .dta file should be modified as needed.
use   fehome gunlaw news polviews sex   using c:\!docs\S210a\gss94.dta

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* Missing data

* Fehome has missing data scored 9 and 0
replace fehome=. if fehome==9
replace fehome=. if fehome==0

* Gunlaw has missing data scored as 9, 0.
replace gunlaw=. if gunlaw==9
replace gunlaw=. if gunlaw==0

* News has NAP cases scored as 0.
replace news=. if news==0

* Polviews has various missing data scored as 8 or 9.
replace polviews=. if polviews>7

* Sex has no missing data.

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* GENDER AND NEWSPAPER READING

* Frequency counts
tab sex news

* Joint and marginal probabilities
tab sex news , cell

* Newspaper reading, conditional on gender
* (Also, marginal probabilities of newspaper reading)
tab sex news , row

* Gender, conditional on newspaper reading
* (Also, marginal probabilities of gender)
tab sex news , column

* Assess how nearly independent gender and newspaper reading are:

* ...by visually comparing conditional probabilities of news, given sex
tab sex news , row nofreq

* ...by visually comparing conditional probabilities of sex, given news
tab sex news , column nofreq

* ...by formally applying a Chi-square test to the null
* statistical hypothesis of independence
tab sex news , nofreq chi2

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* GENDER AND ATTITUDE TOWARD WOMEN IN HOME OR POLITICS

* Frequency counts
tab sex fehome

* Joint and marginal probabilities
tab sex fehome , cell

* Women's place, conditional on gender
* (Also, marginal probabilities of women's place)
tab sex fehome , row

* Gender, conditional on women's place
* (Also, marginal probabilities of gender)
tab sex fehome , column

* Assess how nearly independent gender and women's place are:

* ...by visually comparing conditional probabilities of women's
* place, given sex
tab sex fehome , row nofreq

* ...by visually comparing conditional probabilities of sex, given
* women's place
tab sex fehome , column nofreq

* ...by formally applying a Chi-square test to the null
* statistical hypothesis of independence
tab sex fehome , nofreq chi2


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* GENDER AND ATTITUDE TOWARD GUN LAW

* Frequency counts
tab sex gunlaw

* Joint and marginal probabilities
tab sex gunlaw , cell

* Gunlaw, conditional on gender
* (Also, marginal probabilities of gunlaw)
tab sex gunlaw , row

* Gender, conditional on gunlaw
* (Also, marginal probabilities of gender)
tab sex gunlaw , column

* Assess how nearly independent gender and gunlaw are:

* ...by visually comparing conditional probabilities of gunlaw,
* given sex
tab sex gunlaw , row nofreq

* ...by visually comparing conditional probabilities of sex, given
* gunlaw
tab sex gunlaw , column nofreq

* ...by formally applying a Chi-square test to the null
* statistical hypothesis of independence
tab sex gunlaw , nofreq chi2


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