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6 Cards in this Set
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- Back
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How do we analyze categorical data or ordinal data? |
•How do we analyze categorical data or ordinal data? –One sample tests for a single proportion –Cross tabulation tables –Relative Risks, Odds Ratios –Chi Square Test of Independence |
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When do we use One Sample Test of Proportion ? |
One Sample Test of Proportion :
•Interested in estimating the proportion of individuals with a certain quality in a population |
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One sample test of proportionsusing SAS |
One sample test of proportions using SAS proc freq data=name; tables var / binomial(p=p0); run; Note: -binomial’ provides the binomial proportion, confidence limits and tests for one-way tables -p=p0 Null hypothesis probability (default is 0.50) |
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SAS CommentsOrder of Levels in PROC FREQ |
SAS CommentsOrder of Levels: •PROC FREQ will run a binomial testassuming that the probability of interest is the first level of the variable(in sorting order) in the TABLES statement. |
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SAS Comments Order of Levels . Modified SAS Program Ifthe variable had been coded 0 (no) and 1 (yes) |
Ifthe variable had been coded 0 (no) and 1 (yes) the following code would beappropriate procfreq data=in.pbkid; tables colic/ binomial(p=0.07 level=2); run; |
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Odds of event |
Odds of event The odds of an event is simply the probability of the event occurring divided by the probability of the event not occurring NOTE:Another way to think about odds is the ratio of the number in the sample who have the outcome of interest to the number who do not ie.Ratio of people |
