X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=doc%2Fstatistics.texi;h=921ea8574f77a90b69a160a76238dc52cf93823a;hb=ddb1eb19cb9b78b1163a85d73dd05e8798a8037d;hp=89e5e83c56862dcf4dce5804d073ed7ae2652907;hpb=a1efcf97ca2f75f4be6a0389ff2372c03ed2d4e1;p=pspp-builds.git diff --git a/doc/statistics.texi b/doc/statistics.texi index 89e5e83c..921ea857 100644 --- a/doc/statistics.texi +++ b/doc/statistics.texi @@ -205,12 +205,13 @@ boundaries of the data set divided into the specified number of ranges. For instance, @code{/NTILES=4} would cause quartiles to be reported. The HISTOGRAM subcommand causes the output to include a histogram for -each specified variable. The X axis by default ranges from the +each specified numeric variable. The X axis by default ranges from the minimum to the maximum value observed in the data, but the MINIMUM and MAXIMUM keywords can set an explicit range. The Y axis by default is labeled in frequencies; use the PERCENT keyword to causes it to be labeled in percent of the total observed count. Specify NORMAL to superimpose a normal curve on the histogram. +Histograms are not created for string variables. The PIECHART adds a pie chart for each variable to the data. Each slice represents one value, with the size of the slice proportional to @@ -347,9 +348,7 @@ is present, the VARIABLES subcommand must precede the TABLES subcommand. In general mode, numeric and string variables may be specified on -TABLES. Although long string variables are allowed, only their -initial short-string parts are used. In integer mode, only numeric -variables are allowed. +TABLES. In integer mode, only numeric variables are allowed. The MISSING subcommand determines the handling of user-missing values. When set to TABLE, the default, missing values are dropped on a table by @@ -532,6 +531,7 @@ is used. * BINOMIAL:: Binomial Test * CHISQUARE:: Chisquare Test * WILCOXON:: Wilcoxon Signed Ranks Test +* SIGN:: The Sign Test @end menu @@ -544,7 +544,7 @@ is used. [ /BINOMIAL[(p)]=var_list[(value1[, value2)] ] ] @end display -The binomial test compares the observed distribution of a dichotomous +The /BINOMIAL subcommand compares the observed distribution of a dichotomous variable with that of a binomial distribution. The variable @var{p} specifies the test proportion of the binomial distribution. @@ -566,7 +566,7 @@ values. If more than two distinct, non-missing values for a variable under test are encountered then an error occurs. -If the test proportion is equal to 0.5, then a one tailed test is +If the test proportion is equal to 0.5, then a two tailed test is reported. For any other test proportion, a one tailed test is reported. For one tailed tests, if the test proportion is less than @@ -584,7 +584,7 @@ even for very large sample sizes. @node CHISQUARE -@subsection Chisquare test +@subsection Chisquare Test @vindex CHISQUARE @cindex chisquare test @@ -594,7 +594,7 @@ even for very large sample sizes. @end display -The chisquare test produces a chi-square statistic for the differences +The /CHISQUARE subcommand produces a chi-square statistic for the differences between the expected and observed frequencies of the categories of a variable. Optionally, a range of values may appear after the variable list. If a range is given, then non integer values are truncated, and values @@ -612,7 +612,7 @@ If no /EXPECTED subcommand is given, then then equal frequencies are expected. @node WILCOXON -@subsection Wilcoxon +@subsection Wilcoxon Matched Pairs Signed Ranks Test @comment node-name, next, previous, up @vindex WILCOXON @cindex wilcoxon matched pairs signed ranks test @@ -621,9 +621,10 @@ are expected. [ /WILCOXON varlist [ WITH varlist [ (PAIRED) ]]] @end display -The wilcoxon subcommand tests for differences between means of the -variables listed. The test does not make any assumptions about the -variances of the samples. +The /WILCOXON subcommand tests for differences between medians of the +variables listed. +The test does not make any assumptions about the variances of the samples. +It does however assume that the distribution is symetrical. If the @code{WITH} keyword is omitted, then tests for all combinations of the listed variables are performed. @@ -637,8 +638,32 @@ If the @code{WITH} keyword is given, but the of variable preceding @code{WITH} against variable following @code{WITH} are performed. -If the number of observations is large, and exact tests have been -requested. then the test may take a very long time to complete. + +@node SIGN +@subsection Sign Test +@vindex SIGN +@cindex sign test + +@display + [ /SIGN varlist [ WITH varlist [ (PAIRED) ]]] +@end display + +The /SIGN subcommand tests for differences between medians of the +variables listed. +The test does not make any assumptions about the +distribution of the data. + +If the @code{WITH} keyword is omitted, then tests for all +combinations of the listed variables are performed. +If the @code{WITH} keyword is given, and the @code{(PAIRED)} keyword +is also given, then the number of variables preceding @code{WITH} +must be the same as the number following it. +In this case, tests for each respective pair of variables are +performed. +If the @code{WITH} keyword is given, but the +@code{(PAIRED)} keyword is omitted, then tests for each combination +of variable preceding @code{WITH} against variable following +@code{WITH} are performed. @node T-TEST @comment node-name, next, previous, up @@ -814,7 +839,6 @@ If the total sum of the coefficients are not zero, then PSPP will display a warning, but will proceed with the analysis. The @code{CONTRAST} subcommand may be given up to 10 times in order to specify different contrast tests. -@setfilename ignored @node RANK @comment node-name, next, previous, up