Explore Statistics
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 displayed; you can specify a different confidence level.
M-estimators. Robust alternatives to the sample mean and median for estimating the location. The estimators who are calculated differ in the weights that 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.
- Percentiles
- The Percentiles procedure displays tables of percentiles. When you select
Percentile, by default displays the values for the 5th, 10th, 25th, 50th,
75th, 90th, and 95th percentiles. Values of a quantitative variable that divide the ordered data
into groups so that a certain percentage is above and another percentage is below.
- Quartiles
- Quartiles (the 25th, 50th, and 75th percentiles) divide the observations into four groups of equal size.
- Custom
- When you select Custom, enter at least one value to run the analysis. The input values must be a number in the range 0 - 100. Use the Add, Change, and Remove buttons to work with the values in the percentile value list.
- Method
- By default, HAVERAGE method is selected for computing percentiles. For details on the methods, see the PERCENTILES Subcommand (EXAMINE command) procedure.
Specifying Statistics for Explore
This feature requires the Statistics Base option.
- From the menus choose:
- In the Explore dialog box, select Both or Statistics in the Display group to enable the Statistics button.
- Click Statistics and select one or more statistics.