| • | Levene’s test based on median for testing homogeneity of variances.
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| • | A SUBCAT command that categorizes the desired factors just for the purpose of the analysis.
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| • | Standard error and confidence interval for the trimmed mean.
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| • | Winsorized mean, its standard error and confidence interval.
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| • | Sample mode and mode based on kernel density estimate of data.
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| • | Interquartile range
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| • | In Hypothesis Testing, SYSTAT 13 provides bootstrap-based p-values and histograms of the test
statistic obtained from the bootstrap samples. Apart from the usual p-values of the tests, users can
now request bootstrap-based p-values in all tests for mean (one-sample z, one-sample t, two-
sample z, two-sample t, paired t, Poisson) and variance (single variance, two variances and several
variances)
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| • | In Least-Squares Linear Regression, a choice of bootstrapping residuals has been included.
Bootstrap estimates of the regression coefficients, their biases, standard errors, and confidence
intervals are then computed based on these.
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| • | Relative Risk: In a 2 x 2 table, the relative risk is the ratio of the proportions of cases having a
‘positive’ outcome in the two groups defined by row or column. Relative Risk is a common measure
of association for dichotomous variables.
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| • | Mode: SYSTAT 13 gives an option to list only the first N categories in a one-way table (frequency
distribution). This is done by adding a MODE = N option to the PLENGTH command within XTAB.
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| • | Output categorized appropriately based on the type of table, and reorganized table of measures.
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| • | One-sample Hotelling’s T2 test for mean vector of multivariate data equal to a known vector.
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| • | Two-sample Hotelling’s T2 test for equality of two mean vectors of multivariate data.
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| • | Simplified and easy user interface and command line structure to analyze binary, multinomial,
conditional, and discrete choice models separately.
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| • | Option to specify the reference level for the binary and multinomial response models.
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| • | Simpler form of input data to analyze matched sample case-control studies with one case and
any number of controls per set.
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| • | For Discrete choice models, SYSTAT 13 provides two data layouts: ‘Choice set’ and ‘By choice’
to model an individual’s choices in response to the characteristics of the choices.
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| • | Jonckeere-Terpstra test as an alternative to Mann-Whitney test: The test is used when the
treatments are ordered in terms of the response. This test is based on the sum of the k(k-1)/2 Mann-
Whitney counts (for k treatments).
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| • | Fligner-Wolfe test as an alternative to Mann-Whitney test: The test is used when one of the
treatments acts as a control, to test equality of response to control vis-à-vis all other treatments,
with a one-sided alternative. This is a Mann-Whitney test with two groups when the control is one
group and all other treatments together form another.
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| • | Post hoc (multiple comparisons) tests of Dwass-Steel-Critchlow-Fligner and of Conover-Inman
which can be used as a follow-up when a Kruskal-Wallis test shows significance.
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| • | A multiple comparison test due to Conover as a follow-up of Friedman test showing significance.
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