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st: sign test output


From   Nahla Betelmal <nahlaib@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: sign test output
Date   Wed, 16 Jan 2013 08:38:35 +0000

Dear statalist,

I have generated this output using  non-parametric test "one sample
sign test" with null: U=0 , & Ua > 0

However, I do not understand the output. where is the p-value? is it
0.5 in all cases or the 0.000 ( as in the first and third cases) and
1.000 as in the second case?

many thanks

Nahla


signtest DA_T_1= 0

Sign test

        sign |    observed    expected
-------------+------------------------
    positive |         221         173
    negative |         125         173
        zero |           0           0
-------------+------------------------
         all |         346         346

One-sided tests:
  Ho: median of DA_T_1 = 0 vs.
  Ha: median of DA_T_1 > 0
      Pr(#positive >= 221) =
         Binomial(n = 346, x >= 221, p = 0.5) =  0.0000

  Ho: median of DA_T_1 = 0 vs.
  Ha: median of DA_T_1 < 0
      Pr(#negative >= 125) =
         Binomial(n = 346, x >= 125, p = 0.5) =  1.0000

Two-sided test:
  Ho: median of DA_T_1 = 0 vs.
  Ha: median of DA_T_1 != 0
      Pr(#positive >= 221 or #negative >= 221) =
         min(1, 2*Binomial(n = 346, x >= 221, p = 0.5)) =  0.0000
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