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USGS Fact Sheet 077-03

Table 2. Differences of measurements at the National Trends Network sites using the paired t-test and the Wilcoxon signed-rank test during phase III supplemental data evaluation

  Precipitation event data set False positives removed Precipitation event data set False positives removed
 
Site Mean difference p-value Mean equals zero Mean difference p-value Mean equals zero p-value Median equals zero p-value Median equals zero
 
  Paired t-test Wilcoxon signed-rank test
IL11 East 0.008 0.183 Do not reject 0.006 0.402 Do not reject 0.097 Do not reject 0.439 Do not reject
IL11 West 0.010 0.001 Reject 0.007 0.205 Do not reject ~0 Reject 0.199 Do not reject
MN16 0.004 0.615 Do not reject 0.003 0.769 Do not reject 0.001 Reject 0.130 Do not reject
NV03 0.008 ~0 Reject 0.005 0.373 Do not reject ~0 Reject 0.144 Do not reject
PA15 -0.009 0.137 Do not reject -0.009 0.125 Do not reject 0.543 Do not reject 0.446 Do not reject

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