Figure 4From: Using the bootstrap to establish statistical significance for relative validity comparisons among patient-reported outcome measures Histogram of simulated RV estimates for SF-12 RP by denominator F-statistic. The SF-12 RP had RV = 0.59. The sample size and correlation with the reference measure were fixed at the values observed in the original data. Abbreviations: RV, relative validity; SF-12, Short Form 12; RP, role physical.Back to article page