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