Descriptive Statistics - Advanced tab
In the Descriptive Statistics dialog box, select the Advanced tab to access options that specify the type of descriptive statistics to use to calculate each variable.
The selections made here determine the statistics calculated when the Summary: Statistics button is clicked on this tab or the Quick tab.
Summary: Statistics
- Click this button to produce a spreadsheet with the descriptive statistics for the selected variables.
- Use the options described below to request specific descriptive statistics.
G1
Click this button to produce a compound graph for each selected variable. These graphs are a quick way to graphically explore variables, and consist of the following elements:
Click this button to produce a compound graph for each selected variable, consist of the following elements:
- Histogram
- Horizontal box plot
- Descriptive statistics, including variance, skewness, confidence for mean, etc.
Compute statistics
The options selected in these fields determine which statistics are computed when you click the Summary: Statistics button on this tab or the Quick tab.
Refer to the Introductory Overview for a discussion of the most common descriptive statistics and their interpretation.
Location, valid N
Select the check box next to the statistics you want computed.
Uses for the statistics in this group box:
- To estimate the location of the distribution.
- To determine the number of valid cases for each selected variable (Valid N and Percent of Valid Observation).
- To estimate a variety of location statistics including
Mean,
Sum,
Median,
Mode,
Geometric mean, and
Harmonic mean.
Variation, moments
Select the check box next to the statistics you want to compute.
Uses for the statistics in this group box:
- Estimate the variation for the variable
- Estimate a variety of its moments and their standard errors.
- Specify the confidence Interval via the edit box to estimate the Standard Deviation, CI for Sample SD Interval, Coefficient of Variation, Variance, Standard error of the mean, and Confidence limits for means. (Refer to the Introductory Overview for a basic discussion of confidence limits.)
- Calculate the
Skewness and its
Standard error as well as the
Kurtosis and its
Standard error.
Percentiles, ranges
Select the check box next to the statistics you want to compute.
Uses for the options in this group box:
To estimate a variety of percentiles and ranges for each variable, you can select:
- Minimum & maximum values
- Lower & upper quartiles
- Percentile boundaries
- Use the Boundaries option button (located under the Percentile boundaries check box) to enter which percentiles you want calculated by editing the percentages in the adjacent edit field (the default boundaries are the deciles)
- Use the Intervals option button to divide the percentiles evenly among the interval number in the adjacent edit field (the default interval is 10, which would also give the deciles of the data).
- Range
Note:
- Quartile range
> Computation of median and quartiles (25th, 50th, and 75th percentiles)
When the distribution of values cannot be exactly divided into halves and quartiles,you can compute the respective median and quartile values (and percentiles) in different ways. The specific method of computation for those values can be configured system-wide via the
Computations of percentiles option in the
Options dialog box -
Analyses/Graphs: Limits tab.
Select all stats
- Quartile range
> Computation of median and quartiles (25th, 50th, and 75th percentiles)
When the distribution of values cannot be exactly divided into halves and quartiles,you can compute the respective median and quartile values (and percentiles) in different ways. The specific method of computation for those values can be configured system-wide via the
Computations of percentiles option in the
Options dialog box -
Analyses/Graphs: Limits tab.
Click this button to select all of the statistics.
Reset
Click this button to clear all but the default statistics.
The default statistics are: