A comprehensive strength database including the results of 254 polyaxial tests on six different rock types is collected, and for each rock type the data are randomly divided into two subsets of training and test sets.
Our group has conducted previous data collection activities of this type, the data of which can be found in [18].
Given the assumption that the log-ratio distributional differences were not associated with tissue type, the data were scale normalized between arrays using quantile normalization of the log-ratios (rather than a robust scale normalization, such as MAD scaling).
A total of 201 plates with 96 samples per plate were used to type the data (although some plates were incomplete).
In the absence of any prior RCTs of this type, the data provided by this study will undoubtedly influence future treatment guidelines for the treatment of resistant hypertension.
Furthermore, the accuracy of registry results is not known; the surgeon may type the data into the wrong box on the form, or the register may enter wrong data into the database.
