1.显著性检验(significance test)就是事先对总体(随机变量)的参数或总体分布形式做出一个假设,然后利用样本信息来判断这个假设(原假设)是否合理,即判断总体的真实情况与原假设是否有显著性差异。 或者说,显著性检验要判断样本与我们对总体所做的假设之间的差异是纯属机会变异,还是由我们所做的假设与总体真实情况之间不...
The Z-test was used to evaluate the diagnostic ability between two ROC curves. P < 0.05 was considered statistically significant. Results Patient characteristics The characteristics, including age, gender, and rates of HBV infection, were compared between non-HCC and HCC cohorts within the ...
"from scipy.stats import mannwhitneyu\n", "stat, p_value = mannwhitneyu(a_dist, b_dist, alternative=\"less\")\n", "print(f\"Mann-Whitney U test for null hypothesis B <= A is {p_value:0.3f}\")" ] } ], "metadata": { "kernelspec": { "display_name": "Python3_kernel",...
Full size image We calculated calibration curves with the Hosmer–Lemeshow test for the model in both the training (P = 0.612) and validation (P = 0.129) groups, indicating good model fit (Figure. S1A, B). Additionally, we examined the clinical utility of the model in both train...
Red cross – the center point of test area in S isotope analysis. DownLoad: Full-Size Img PowerPoint The solar activity of the 81–110 yr cycle Ⅱ caused further SSFL thickness variation in different CSR Ⅲ (Fig. 8C). During the weak solar activity period in the 81–110 yr cycle ...