Whichever method you choose, the syntax is identical.
When using the interactive method, @pspp{} tells you that it's waiting for your
-data with a string like @prompt{@pspp{}>} or @prompt{data>}.
+data with a string like @prompt{PSPP>} or @prompt{data>}.
In the examples of this chapter, whenever you see text like this, it
indicates the prompt displayed by @pspp{}, @emph{not} something that you
should type.
@float Example, data-list
@cartouche
@example
-@prompt{@pspp{}>} data list list /forename (A12) height.
-@prompt{@pspp{}>} begin data.
+@prompt{PSPP>} data list list /forename (A12) height.
+@prompt{PSPP>} begin data.
@prompt{data>} Ahmed 188
@prompt{data>} Bertram 167
@prompt{data>} Catherine 134.231
@prompt{data>} David 109.1
@prompt{data>} end data
-@prompt{@pspp{}>}
+@prompt{PSPP>}
@end example
@end cartouche
@caption{Manual entry of data using the @cmd{DATA LIST} command.
variable and that its maximum length is 12 bytes.
The second variable's name is specified by the text @samp{height}.
Since no format is given, this variable has the default format.
+Normally the default format expects numeric data, which should be
+entered in the locale of the operating system.
+Thus, the example is correct for English locales and other
+locales which use a period (@samp{.}) as the decimal separator.
+However if you are using a system with a locale which uses the comma (@samp{,})
+as the decimal separator, then you should in the subsequent lines substitute
+@samp{.} with @samp{,}.
+Alternatively, you could explicitly tell @pspp{} that the @var{height}
+variable is to be read using a period as its decimal separator by appending the
+text @samp{DOT8.3} after the word @samp{height}.
For more information on data formats, @pxref{Input and Output Formats}.
@item
-Normally, @pspp{} displays the prompt @prompt{@pspp{}>} whenever it's
+Normally, @pspp{} displays the prompt @prompt{PSPP>} whenever it's
expecting a command.
However, when it's expecting data, the prompt changes to @prompt{data>}
so that you know to enter data and not a command.
Once the data has been entered,
you could type
@example
-@prompt{@pspp{}>} list /format=numbered.
+@prompt{PSPP>} list /format=numbered.
@end example
@noindent
to list the data.
You can can tell the @cmd{DATA LIST} command to read the data directly from
this file instead of by manual entry, with a command like:
@example
-@prompt{@pspp{}>} data list file='mydata.dat' list /forename (A12) height.
+@prompt{PSPP>} data list file='mydata.dat' list /forename (A12) height.
@end example
@noindent
Notice however, that it is still necessary to specify the names of the
not mandatory.
The following syntax loads a file called @file{my-file.sav}.
@example
-@prompt{@pspp{}>} get file='my-file.sav'.
+@prompt{PSPP>} get file='my-file.sav'.
@end example
@noindent
You will encounter several instances of this in future examples.
The following syntax will save the existing data and variables to a
file called @file{my-new-file.sav}.
@example
-@prompt{@pspp{}>} save outfile='my-new-file.sav'.
+@prompt{PSPP>} save outfile='my-new-file.sav'.
@end example
@noindent
If @file{my-new-file.sav} already exists, then it will be overwritten.
@float Example, descriptives
@cartouche
@example
-@prompt{@pspp{}>} get file='@value{example-dir}/physiology.sav'.
-@prompt{@pspp{}>} descriptives sex, weight, height.
+@prompt{PSPP>} get file='@value{example-dir}/physiology.sav'.
+@prompt{PSPP>} descriptives sex, weight, height.
@end example
Output:
@cartouche
[@dots{} continue from @ref{descriptives}]
@example
-@prompt{@pspp{}>} examine height, weight /statistics=extreme(3).
+@prompt{PSPP>} examine height, weight /statistics=extreme(3).
@end example
Output:
@float Example, reliability
@cartouche
@example
-@prompt{@pspp{}>} get file='@value{example-dir}/hotel.sav'.
-@prompt{@pspp{}>} display dictionary.
-@prompt{@pspp{}>} * recode negatively worded questions.
-@prompt{@pspp{}>} compute v3 = 6 - v3.
-@prompt{@pspp{}>} compute v5 = 6 - v5.
-@prompt{@pspp{}>} reliability v1, v3, v5.
+@prompt{PSPP>} get file='@value{example-dir}/hotel.sav'.
+@prompt{PSPP>} display dictionary.
+@prompt{PSPP>} * recode negatively worded questions.
+@prompt{PSPP>} compute v3 = 6 - v3.
+@prompt{PSPP>} compute v5 = 6 - v5.
+@prompt{PSPP>} reliability v1, v3, v5.
@end example
Output (dictionary information omitted for clarity):
@float Example, normality
@cartouche
@example
-@prompt{@pspp{}>} get file='@value{example-dir}/repairs.sav'.
-@prompt{@pspp{}>} examine mtbf
+@prompt{PSPP>} get file='@value{example-dir}/repairs.sav'.
+@prompt{PSPP>} examine mtbf
/statistics=descriptives.
-@prompt{@pspp{}>} compute mtbf_ln = ln (mtbf).
-@prompt{@pspp{}>} examine mtbf_ln
+@prompt{PSPP>} compute mtbf_ln = ln (mtbf).
+@prompt{PSPP>} examine mtbf_ln
/statistics=descriptives.
@end example
For the @var{height} variable, the output shows the significance of the
Levene test to be 0.33 which means there is a
33% probability that the
-Levene test produces this outcome when the variances are unequal.
-Such a probability is too high
-to assume that the variances are equal so the row
-for unequal variances should be used.
+Levene test produces this outcome when the variances are equal.
+Had the significance been less than 0.05, then it would have been unsafe to assume that
+the variances were equal.
+However, because the value is higher than 0.05 the homogeneity of variances assumption
+is safe and the ``Equal Variances'' row (the more powerful test) can be used.
Examining this row, the two tailed significance for the @var{height} t-test
is less than 0.05, so it is safe to reject the null hypothesis and conclude
that the mean heights of males and females are unequal.
For the @var{temperature} variable, the significance of the Levene test
-is 0.58 so again, it is unsafe to use the row for equal variances.
-The unequal variances row indicates that the two tailed significance for
-@var{temperature} is 0.19. Since this is greater than 0.05 we must reject
+is 0.58 so again, it is safe to use the row for equal variances.
+The equal variances row indicates that the two tailed significance for
+@var{temperature} is 0.20. Since this is greater than 0.05 we must reject
the null hypothesis and conclude that there is insufficient evidence to
suggest that the body temperature of male and female persons are different.
@float Example, t-test
@cartouche
@example
-@prompt{@pspp{}>} get file='@value{example-dir}/physiology.sav'.
-@prompt{@pspp{}>} recode height (179 = SYSMIS).
-@prompt{@pspp{}>} t-test group=sex(0,1) /variables = height temperature.
+@prompt{PSPP>} get file='@value{example-dir}/physiology.sav'.
+@prompt{PSPP>} recode height (179 = SYSMIS).
+@prompt{PSPP>} t-test group=sex(0,1) /variables = height temperature.
@end example
Output:
@example
@float Example, regression
@cartouche
@example
-@prompt{@pspp{}>} get file='@value{example-dir}/repairs.sav'.
-@prompt{@pspp{}>} regression /variables = mtbf duty_cycle /dependent = mttr.
-@prompt{@pspp{}>} regression /variables = mtbf /dependent = mttr.
+@prompt{PSPP>} get file='@value{example-dir}/repairs.sav'.
+@prompt{PSPP>} regression /variables = mtbf duty_cycle /dependent = mttr.
+@prompt{PSPP>} regression /variables = mtbf /dependent = mttr.
@end example
Output:
@example
predictor of the time to repair.
-@c LocalWords: @pspp{} dir itemize noindent var cindex dfn cartouche samp xref
+@c LocalWords: PSPP dir itemize noindent var cindex dfn cartouche samp xref
@c LocalWords: pxref ie sav Std Dev kilograms SYSMIS sansserif pre pspp emph
@c LocalWords: Likert Cronbach's Cronbach mtbf npplot ln myfile cmd NPAR Sig
@c LocalWords: vindex Levene Levene's df Diff clicksequence mydata dat ascii
projects / pspp / blobdiff