Bilimsel Çalışmalarda P-Değerinin Rapor Edilmesi P

Yıl 2005, Cilt: 11 Sayı: 04, 359 - 364, 01.11.2005

Mehmet Mendeş Serkan Subaşı Ensar Başpınar

https://doi.org/10.1501/Tarimbil_0000000565

Cited By: 2

Öz

Bilindiği üzere bilimsel çalışmaların sonuçları genellikle P-değerinden yararlanılarak rapor edilmektedir. Ancak, çalışmaların istatistik analizleri sonucunda bulunan P-değerlerinin, P

Anahtar Kelimeler

P-değeri, 1.tip hata, önemlilik seviyesi, hipotez kontrolleri, istatistik

Reporting of the P-Value in Scientific Research P

Öz

It is known that results of scientific research are reported using P-value in general. However, the conventional use of P values P 0.05 after statistical analysis may misleads the readers. When two studies reach the same conclusion P>0.05, but with different P values, reliability of these two studies cannot be the same though the decisions are identical. In this study, the hypothesis stating there is no difference among the surface hardness values from 3 different points of a concrete block with the dimensions 15x100x200 cm is checked. The study calls attention to the P-value and therefrom reached decision on Ho hypothesis, and the changes in the correctness levels of the mentioned decision, in the case of having different number of replications in the experiments carried out with the same objectives. As a result, it would be proper and more useful for the third parties if the P-values found with the statistical analysis were presented as exact probability values P=x.xxx

Anahtar Kelimeler

P-value, type I error, significance level, hypothesis testing, statistics

Kaynakça

• Barnard, G. A. 1990. Must clinical trails be large? The interpratation of P-values and the combination of test results. Statistics in Medicine 9, 601-614.
• Bek, Y. ve E. Efe. 1987. Araştırma ve Deneme Metotları I. Ç.Ü.Ziraat Fakültesi Yayın No:71, Adana.
• Chia, K. S. 1997. Significant-it is-An obsession with the P-value. Scanadavian Journal of Public Health 23, 152-154.
• Cohen, J. 1994. The earth is round (P
• Frick, R. W. 1996. The appropriate use of null hypothesis testing. Psychological Methods 1, 379-390.
• Gibbons, J. D. 1985. P-values. in Encyclopedia of Statistical Sciences eds. Kotz, S., Johnson, N. L., 6, 366-368.
• Goodman, S. N. 1999. The P-value fallacy in medical statistics. Annals of International Medicine 130, 995-1004.
• Hassan, M., A. M. Khurshid. 2001. Role of P-values in decision making. Proc. Eight Stat. Semp., 7 (8), 123-130.
• Huang, H. M. J., R. T. O’Neil, P. Bauer and K. Kohne. 1997. The behavior of the P-value when alternative hypothesis is true? Biometrics 53, 11-22.
• Lehmann, E. L. 1959. Testing Statistical Hypotheses. New York: Wiley USA.
• Little, T. M. 1981. Interpretation and presentation of results. Hortscience 16:637-640.
• Mendeş, M. (2002). Normal dağılım ve varyansların homojenliği ön şartlarının gerçekleşmediği durumlarda varyans analizi tekniği yerine kullanılabilecek bazı parametrik alternatif testlerin I.tip hata ve testin gücü bakımından irdelenmesi, Ankara Üniv., Fen Bil. Enstitüsü, Doktora Tezi (Basılmamış).
• Motulsky, H. J. 1995. Interpretting nonsignificant P-values. Instuitive Biostatistics, Oxford University Inc. Oxford.
• Parkhurst, D. F. 1985. Interpreting failure to reject a null hypothesis. Bulletin of the Ecological Society of America 66:301-302.
• Ramp, W. K., J. M. Yancey. 1991. P-values and their problems. Bone and Mineral 13, 163-165.
• Schervish, M. J. 1996. P values: What they are and what they are not. The American Statistician 50,3,203-206.
• Subaşı, S. 2001. Kalıp Yüzey Farklılıklarının Betonun Bazı Fiziksel Özellikleri Üzerine Etkileri, Gazi Üniv., Fen Bilimleri Enst., Y.Lisans Tezi (Basılmamış).
• Winer,B.J., D. R. Brown and K. M. Michels. 1991. Statistical principles in experimental design. McGraw-Hill Book Company, New York: USA.
• Zar, J. H. 1999. Biostatistical analysis. Prentice –Hall Inc. Simon and Schuster/A Viacom Company, New Jersey: USA.