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STATS 2 MENU ITEMS
DISTRIBUTIONS
This set of items calculates probabilities for the given
distribution based upon values which you input in response to
questions. No data variables are used.
-T-Tests
There are three T-tests available. Test 1 calculates the chance
that a given variable has a certain mean. You are asked to choose
a variable and to specify a mean to test.
The second test checks the chance that two variables have the same
mean. You have to select two variables. The two variables should
be randomly selected and unrelated.
The third T test is designed for two variables which are related.
Once again you simply select two variables.
-Multivariate
There are three somewhat similar procedures: Factor analysis,
Discriminant analysis and Canonical Correlation analyses.
For factor analysis, you first select the variables which you
want in the study. You must then select the type of rotation
desired. If you choose an orthoblique rotation, then an
orthoblique factor must be entered. The orthoblique factor must
be from 0 to 0.5.
In discriminant analysis, you must first select the independent
variables. You next choose the dependent variable.
In both procedures the data entry screen is used to display
results. No text input can be made, but all menu functions
and arrows work.
You are given an opportunity to save the results to the data
matrix so that you may use them in other work. Be carefull however
as this is a destructive process. Your original data will be lost.
The third choice is for Canonical Correlations. In this case you
must pick two sets of variables. The number of variables in the
second set must be less than or equal to those in the first set.
You will next be asked if you want to save the canonical variates.
This is a destructive process and all existing data will be wiped
out. The output is similar to that for discriminant analysis.
As well there is a procedure for determining the real eigen
values and associated eigen vectors of square matrices. You will be
asked to specify a range of data for the matrix. This is done
in the same way as for specifying a range to read from a 123
spreadsheet. The program will return the answers or an error
message if the area selected is not square.
-ANOVA
The Analysis of Variance section allows for flexibility in data
structure. The one-way studies all require that the data be set up
in a traditional ANOVA matrix structure. Questions will not be
asked for the random, blocked, or latin square designs. For
nested, you will be asked to specify the number of treatments in a
block. For the 2- and 3-way ANOVA designs, either the data can be
set up in a matrix (the default), or separate variables can be
used to represent the levels of the variables. In a 3-way design
not using matrices, you would be asked for the variable that held
the results and then, in turn, for the variable containing the level
information for factors A, B, and C. For data in matrix form, you
would need to specify the number of levels in A and B. For the 2-
factor case the input required is similar.
-Variance Tests
The 1-factor test asks for a variable name and a value to test.
The value tested is the standard deviation and the program will
give back the chance of the variable was chosen from a population
with the given standard deviation. The 2-factor test compares two
variables to determine the chance that they are both drawn from a
population with the same standard deviation.