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author devteam
date Wed, 25 Sep 2013 11:31:42 -0400
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1 <tool id="t_test_two_samples" name="T Test for Two Samples" version="1.0.0">
2 <description></description>
3 <requirements>
4 <requirement type="package" version="2.11.0">R</requirement>
5 </requirements>
6
7 <command interpreter="perl">
8 t_test_two_samples.pl $inputFile1 $inputFile2 $inputTestSidedness3 $inputStandardDeviationEquality4 $outputFile1
9 </command>
10
11 <inputs>
12 <param format="tabular" name="inputFile1" type="data" label="Select the first sample tabular file"/>
13 <param format="tabular" name="inputFile2" type="data" label="Select the second sample tabular file"/>
14
15 <param name="inputTestSidedness3" type="select" label="Choose the test sidedness:">
16 <option value="two-sided">Two-sided</option>
17 <option value="one-sided:_m1_less_than_m2">One-sided: m1 less than m2</option>
18 <option value="one-sided:_m1_greater_than_m2">One-sided: m1 greater than m2</option>
19 </param>
20
21 <param name="inputStandardDeviationEquality4" type="select" label="Choose the standard deviation equality status of the two populations:">
22 <option value="equal">Equal</option>
23 <option value="unequal">Unequal</option>
24 </param>
25 </inputs>
26
27 <outputs>
28 <data format="text" name="outputFile1"/>
29 </outputs>
30
31 <tests>
32 <test>
33 <param name="inputFile1" value="sample1.tabular" ftype="tabular" />
34 <param name="inputFile2" value="sample2.tabular" ftype="tabular" />
35 <param name="inputTestSidedness3" value="Two-sided" />
36 <param name="inputStandardDeviationEquality4" value="Equal" />
37 <output name="outputFile1" file="t_test_result1.text" />
38 </test>
39
40 <test>
41 <param name="inputFile1" value="sample1.tabular" ftype="tabular" />
42 <param name="inputFile2" value="sample2.tabular" ftype="tabular" />
43 <param name="inputTestSidedness3" value="Two-sided" />
44 <param name="inputStandardDeviationEquality4" value="Unequal" />
45 <output name="outputFile1" file="t_test_result2.text" />
46 </test>
47
48 <test>
49 <param name="inputFile1" value="sample1.tabular" ftype="tabular" />
50 <param name="inputFile2" value="sample2.tabular" ftype="tabular" />
51 <param name="inputTestSidedness3" value="One-sided: m1 less than m2" />
52 <param name="inputStandardDeviationEquality4" value="Equal" />
53 <output name="outputFile1" file="t_test_result3.text" />
54 </test>
55
56 <test>
57 <param name="inputFile1" value="sample1.tabular" ftype="tabular" />
58 <param name="inputFile2" value="sample2.tabular" ftype="tabular" />
59 <param name="inputTestSidedness3" value="One-sided: m1 less than m2" />
60 <param name="inputStandardDeviationEquality4" value="Unequal" />
61 <output name="outputFile1" file="t_test_result4.text" />
62 </test>
63
64 <test>
65 <param name="inputFile1" value="sample1.tabular" ftype="tabular" />
66 <param name="inputFile2" value="sample2.tabular" ftype="tabular"/>
67 <param name="inputTestSidedness3" value="One-sided: m1 greater than m2" />
68 <param name="inputStandardDeviationEquality4" value="Equal" />
69 <output name="outputFile1" file="t_test_result5.text" />
70 </test>
71
72 <test>
73 <param name="inputFile1" value="sample1.tabular" ftype="tabular" />
74 <param name="inputFile2" value="sample2.tabular" ftype="tabular" />
75 <param name="inputTestSidedness3" value="One-sided: m1 greater than m2" />
76 <param name="inputStandardDeviationEquality4" value="Unequal" />
77 <output name="outputFile1" file="t_test_result6.text" />
78 </test>
79 </tests>
80
81
82 <help>
83
84 .. class:: infomark
85
86 **What it does**
87
88 This program implements the non-pooled t-test for two samples where the alternative hypothesis is two-sided or one-sided. The program takes four inputs:
89
90 - The first input file is a TABULAR format file representing the first sample and consisting of one column only.
91 - The second input file is a TABULAR format file representing the first sample and consisting of one column only.
92 - The third input is the sidedness of the t-test: either two-sided or, one-sided with m1 less than m2 or, one-sided with m1 greater than m2.
93 - The fourth input is the equality status of the standard deviations of both populations.
94 - The output file is a TXT file representing the result of the two-sample t-test.
95
96
97 **Example**
98
99 Let us have the first input file representing the first sample as follows::
100
101 5
102 4
103 8
104 6
105 7
106 2
107 1
108 1
109 0
110 6
111 4
112 5
113 7
114 5
115 3
116 2
117 5
118 8
119 7
120 6
121 4
122
123 And the second input file representing the second sample as follows::
124
125 2
126 3
127 5
128 1
129 2
130 7
131 5
132 4
133 3
134 2
135 7
136 6
137 0
138 8
139 4
140 6
141 9
142 2
143 4
144 5
145 6
146
147 Runnig the program and choosing "Two-sided" and "Equal" as parameters will give the following output::
148
149 Two Sample t-test
150
151 data: sample1 and sample2
152 t = -0.3247, df = 40, p-value = 0.7471
153 alternative hypothesis: true difference in means is not equal to 0
154 95 percent confidence interval:
155 -1.720030 1.243839
156 sample estimates:
157 mean of x mean of y
158 4.333333 4.571429
159
160
161 </help>
162
163 </tool>