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