# Orwin's fail safe N test

In Orwin's fail safe N test how to decide the values of criterion for a trivial log odd's ratio and mean log odds ratio in missing studies. I am a medical doctor. Please tell me in simple english. The data are

1. Classic fail-safe N
Z-value for observed studies                                    27.97543
P-value for observed studies                                    0.00000
Alpha                                                          0.05000
Tails                                                           2.00000
Z for alpha                                                    1.95996
Number of observed studies                                    5.00000
Number of missing studies that wouldbring p-value to >alpha  1014.0000

2. Orwin's fail-safe N
Odds ration in observed studies                              5.7339
Criterian for a ‘trivial’ odds ratio                           ?
Mean odds ratio in missing studies                           ?

• something is missing in your first sentence. As it stands now it is incomprehensible from linguistic point of view, for me at least. – mpiktas Feb 18 '11 at 8:25
• @Bernd: Thank you for your interest to help me. I am sorry I was not clear and wasted your time. I am trying to calculate Orwin's fail-safe N. The treatment is inexpensive but has saved thousands of lives already.I am trying to decide on the best values to use for the criterion for a trivial log odd's ratio and mean log odds ratio in missing studies to calculate the Number of missing studies needed to bring down odds ratio (because Classic fail-safe method yielded 1014 studies). I am using Comprehensive meta-analysis v2.2 – DrWho Feb 18 '11 at 13:30