User Guide

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Explore
Explore Stat
istics
Figure 15-3
Explore St atistics dialog box
Descriptives. These measures of central tendency and dispersion are displayed by
default.
Measures of central tendency indicate the location of the distribution; they
include the mean, median, and 5% trimmed mean. Measures of dispersion show the
dissimilarity of the values; these include standard error, variance, standard deviation,
minimum
, maximum, range, and interquartile range. The descriptive statistics also
include measures of the shape of the distribution; skewness and kurtosis are displayed
with their standard errors. The 95% level confidence interval for the mean is also
displa
yed; you can specify a different confidence level.
M-estimators. Robust alternatives to the sample mean and median for estimating the
center of location. The estimators calculated differ in the weights they apply to cases.
Huber’
s M-estimator, Andrews’ wave estimator, Hampel’s redescending M-estimator,
and Tukey’s biweight estimator are displayed.
Outliers. Displays the five largest and five smallest values, with case labels.
Percen
tiles.
Displays the values for the 5th, 10th, 25th, 50th, 75th, 90th, and 95th
percentiles.