/************ senic97d.sps ***************/
include 'senicread97.sps'.
subtitle 'Basic significance tests'.
/* Do hospitals with med schools have lower infection risk?
ttest groups = medschl(1,2) / variables = infrisk.
/* Is routine culturing ratio different from routine x-ray ratio?
ttest pairs = xratio culratio.
/* Does infection risk vary by region of the country?
oneway infrisk by region(1,4) / statistics = descriptives homogeneity
                              /ranges = tukey . /* snk & scheffe also available
/* Does infection risk vary by region of the country and Med schl
/* affiliation considered jointly?
anova variables = infrisk by region(1,4) medschl (1,2).
/* Does likelihood of med school affiliation vary by region of country?
crosstabs tables = region by medschl
                 / statistics = chisq
                 / cells = count row column expected.
/* Is number of nurses related to infection risk?
plot    /format=regression / plot = infrisk with nurses.
/* Correlation matrix of continuous vars - really should do plots too
correlations variables = stay to nbeds,census,nurses,service.