Description Usage Arguments Details Value Author(s) See Also Examples
Performs Wilcoxon signed rank test or Mann-Whitney-Wilcoxon rank sum test depending on data and logicals entered. Relies heavily on the function wilcox.test
. Adds formatting and variances, and prints the z-score and p-value in addition to the test statistic and p-value.
1 2 3 |
y |
numeric vector of data values. Non-finite (missing or infinite) values will be omitted. |
x |
optional numeric vector of data values. Non-finite (missing or infinite) values will be omitted. |
alternative |
specifies the alternative hypothesis for the test; acceptable values are |
mu |
the value of the null hypothesis. |
paired |
logical indicating whether the data are paired or not. Default is |
exact |
logical value indicating whether or not an exact test should be computed. |
correct |
logical indicating whether or not a continuity correction should be used and displayed. |
conf.int |
logical indicating whether or not to calculate and display a 'confidence interval' (performs a semi-parametric test on medians, and is non-robust) and point estimate. |
conf.level |
confidence level for the interval. |
... |
only used in the generic S3 class. |
See above.
A list with class "wilcoxon"
is returned. The print method lays out the information in an easy to read format.
statistic |
the value of the test statistic with a name describing it. |
parameter |
the parameter(s) for the exact distribution of the test statistic. |
p.value |
the p-value for the test (calculated for the test statistic). |
null.value |
the parameter |
alternative |
character string describing the alternative hypothesis. |
method |
the type of test applied. |
data.name |
a character string giving the names of the data. |
conf.int |
a confidence interval for the location parameter (only present if the argument |
estimate |
an estimate of the location parameter (only present if the argument |
table |
a formatted table of rank sum and number of observation values, for printing. |
vars |
a formatted table of variances, for printing. |
hyps |
a formatted table of the hypotheses, for printing. |
inf |
a formatted table of inference values, for printing. |
Scott S. Emerson, M.D., Ph.D., Andrew J. Spieker, Brian D. Williamson
1 2 3 4 5 6 7 8 9 | #- Create the data -#
cf <- c(1153, 1132, 1165, 1460, 1162, 1493, 1358, 1453, 1185, 1824, 1793, 1930, 2075)
healthy <- c(996, 1080, 1182, 1452, 1634, 1619, 1140, 1123, 1113, 1463, 1632, 1614, 1836)
#- Perform the test -#
wilcoxon(cf, healthy, paired=TRUE)
#- Perform the test -#
wilcoxon(cf, healthy, conf.int=TRUE)
|
Attaching package: 'uwIntroStats'
The following object is masked from 'package:base':
tabulate
Wilcoxon signed rank test
obs sum ranks expected
positive 10 71 45.5
negative 3 20 45.5
zero 0 0 0.0
all 13 91 91.0
unadjusted variance 204.75
adjustment for ties 0.00
adjustment for zeroes 0.00
adjusted variance 204.75
H0 Ha
Hypothesized Median 0 two.sided
Test Statistic p-value
V 71 0.080322
Z 1.7821 0.037368
Wilcoxon rank sum test
obs rank sum expected
Y 13 157 175.5
X 13 194 175.5
combined 26 351 351.0
unadjusted variance 380.25
adjustment for ties 0.00
adjusted variance 380.25
H0 Ha
Hypothesized Median 0 two.sided
Test Statistic p-value CI Point Estimate
W 103 0.36216 [-174, 341] 62
Z 0.94872 0.17138
Warning message:
In print.wilcoxon(x) :
The 'confidence interval' presented is semi-parametric and non-robust, and is a test of medians.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.