Different measurements of the Hubble constant (H ₀) are not consistent, and a tension between the CMB based methods and cosmic distance ladder based methods has been observed. Measurements from various distance based methods are also inconsistent. To aggravate the problem, the same cosmological probe (Type Ia SNe for instance) calibrated through different methods also provides different values of H ₀. We compare various distance ladder based methods through the already available unique data obtained from the Hubble Space Telescope (HST). Our analysis is based on parametric (t-test) as well as non-parametric statistical methods such as the Mann-Whitney U test and Kolmogorov-Smirnov test. Our results show that different methods provide different values of H ₀ and the differences are statistically significant. The biases in the calibration would not account for these differences as the data have been taken from a single telescope with a common calibration scheme. The unknown physical effects or issues with the empirical relations of distance measurement from different probes could give rise to these differences.

哈勃常数 ( H ₀ ) 的不同测量值并不一致，并且已经观察到基于 CMB 的方法和基于宇宙距离阶梯的方法之间的张力。各种基于距离的方法的测量结果也不一致。使问题更加严重的是，通过不同方法校准的同一个宇宙学探测器（例如 Ia 型 SNe）也提供了不同的H ₀值。我们通过从哈勃太空望远镜 (HST) 获得的现有独特数据来比较各种基于距离梯的方法。我们的分析基于参数（t 检验）以及非参数统计方法，例如 Mann-Whitney U 检验和 Kolmogorov-Smirnov 检验。我们的结果表明，不同的方法提供不同的值H ₀且差异具有统计学意义。校准中的偏差不会解释这些差异，因为数据是从具有通用校准方案的单个望远镜中获取的。来自不同探头的距离测量的经验关系的未知物理效应或问题可能会导致这些差异。