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  1. Rectal Cancer Treatment (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK65965
    ... in local recurrence at 3 years with a two-sided test at the 5% level of significance.[ 7 ] Cumulative ... months versus 2.7 months (stratified log-rank test, 2-sided P < .001).[ 57 ][ Level of evidence: 1iiDiii ] Palliative ...
  2. Preparing for Ambulatory Computerized Prescriber Order Entry by Evaluating Preimplementation Medication Errors - ... 
    https://www.ncbi.nlm.nih.gov/books/NBK20508
    ... of medication errors when comparing pre- to postimplementation (two-sided test of proportions with an alpha level of 0. ...
  3. Results - Intravascular Diagnostic Procedures and Imaging Techniques Versus Angiography Alone in Coronary Stenting: ... 
    https://www.ncbi.nlm.nih.gov/books/NBK148753
    ... a power calculation using standard formula for a two-sided chi-square test. We based our effect size estimates on the ... a power calculation using standard formula for a two-sided chi-square test. We based our effect size estimates on the ...
  4. Results - Self-Measured Blood Pressure: Future Research Needs - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK132487
    ... a power calculation using standard formulas for a two-sided equivalence test. Given the lack of data for the effects ...
  5. Executive Summary - Future Research Needs for the Comparison of Percutaneous Coronary Interventions with Bypass Graft ... 
    https://www.ncbi.nlm.nih.gov/books/NBK51087
    ... sample size calculations using standard formulae for a two-sided, chi-squared test at the 0.05 level of significance. For ...
  6. NLM Digital Collections - Final impacts of the POWER through choices program : impact report from the Evaluation of ... 
    Publication: [Washington, D.C.] : Department of Health & Human Services, Office of Adolescent Health, September 2016
    resource.nlm.nih.gov/101712273
    ... of 0.20 or less based on a two-sided t-test and (2) other baseline variables that other studies ... of 0.20 or less based on a two-sided t-test and (2) other baseline variables that other studies ...
  7. Colon Cancer Treatment (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK65858
    ... months versus 2.7 months (stratified log-rank test, 2-sided P < .001).[ 65 ][ Level of evidence: 1iiDiii ] Bevacizumab ...
  8. Methods - Future Research Needs for the Comparison of Percutaneous Coronary Interventions with Bypass Graft Surgery in .... 
    https://www.ncbi.nlm.nih.gov/books/NBK51080
    ... sample size calculations using standard formulae for a two-sided chi-squared test at the 0.05 level of significance. We ...
  9. NLM Digital Collections - The Health Consequences of Involuntary Smoking: A Report of the Surgeon General (pages 76-100) 
    Publication: United States. Office on Smoking and Health, 1986
    resource.nlm.nih.gov/101584932X684
    ... of the studies. However, the power for a two-sided test and a one- sided test, based on observed ... Power for Proportion of risk for ever vs. two-sided test one-sided test one-sided trend one-sided ...
  10. NLM Digital Collections - The Health Consequences of Involuntary Smoking: A Report of the Surgeon General (pages 26-50) 
    Publication: United States. Office on Smoking and Health, 1986
    resource.nlm.nih.gov/101584932X682
    ... of statistical significance testing. Either one-sided or two-sided tests may be used; in the first, only effects in one direction are considered a possibility, whereas two-sided tests consider the Possibility of effects in opposing directions, ...
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