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. 2021 Apr 30;21:90. doi: 10.1186/s12874-021-01277-y

Fig. 2.

Fig. 2

Regional distribution of hospitals after resampling and Italian regional distribution of hospitals. In a, boxplots show the distribution of the number of hospitals per region, after applying the considered sampling procedures (Distance, Probability, and Uniform procedures) to the bootstrapped convenience sample. The expected distribution if simple random sampling was applied is shown as reference. Panel b shows the actual number of hospitals per Region in Italy. Regions are color-coded for easier comparison between plots