Nonparametric
Correlations
Select Correlations (Spearman, Kendall
tau, gamma ) from the Nonparametric Statistics Startup Panel - Quick tab to display the Nonparametric Correlations dialog box,
which contains two tabs: Quick and Advanced.
Variables.
Click the Variables button to
display the standard variable selection dialog box. Use these options
to select at least two variables for which correlations will be computed
(each variable in the first list will be correlated with each variable
in the second list).
Compute.
With the options (described below) in the Compute
box, you can choose to compute single nonparametric correlations or matrices
of nonparametric correlations. A useful Graph
of Input Data for the results spreadsheet is the scatterplot,
from which you can easily graph the correlations.
Detailed report. Selecting Detailed report results not only in
the computation of the correlations between the specified variables (see
above), but also in the Valid n,
t-value, and p-value
for each correlation.
Matrix of two lists. Select
Matrix of two lists to compute
only the correlations between the variables specified in the first list
against the variables specified in the second list.
Square matrix. Select Square matrix to compute correlations
from a single list of variables (resulting in a square matrix of correlations).
Note that if you have already specified two lists of variables and then
select this option, the two lists will be "stacked" to make
one list of variables.
Spearman
R. Select the Spearman
R button to display either the
standard variable selection dialog or the results of the analysis (if
you have already selected the variables). Spearman R assumes that the
variables under consideration were measured on at least an ordinal (rank order)
scale, that is, that the individual observations can be ranked into two
ordered series.
Cancel.
Click the Cancel
button to close the dialog box and return to the Nonparametric Statistics Startup
Panel.
Options.
Click the Options button to display
the Options
menu.
By Group.
Click the By Group button to
display the By
Group specification dialog box.
Select
Cases. Click the Select
Cases button to display the Analysis/Graph
Case Selection Conditions dialog box, which contains options
to create conditions for which cases will be included (or excluded) in
the current analysis. More information is available in the case selection
conditions overview,
syntax
summary, and dialog description.
W.
Click the W (Weight)
button to display the Analysis/Graph
Case Weights dialog box, which contains options to adjust the
contribution of individual cases to the outcome of the current analysis
by "weighting" those cases in proportion to the values of a
selected variable.
p-value
for highlighting. The default p-value
for highlighting is .05. You
can adjust this p-value by entering a new value in the text box or using
the microscrolls.
On the summary spreadsheets, STATISTICA
will highlight all p-values that
are equal to or less than the value specified in this field. For more
details on p-value, see Elementary
Concepts.