数学中国w, madio,net Evaluation and improvement of Healthcare Systems 123 Model 2 Basic Assumption and Symbol Definition As before, EV is the evaluation vector with components R (ratio of Re- sources to Performance)and I (index of inequity). The length of the vector, L=VR+1, measures the effectiveness of the healthcare system. Basic model All the points on the same circle have the same length(Figure 6): in other words, the systems have the same effectiveness. Consequently, a system could adjust intemal resources distribution; it could sacrifice the resources/ performance ratio to improve the inequity index, or vice versa h/012,34” Figure 6. Two healthcare systems of equal effectiveness To compare systems, we draw concentric circles according to the evalu- ation vectors. A system with a smaller circle is better Strengths and Weaknesses Model 1 The calculation in Model 1 is simple and clear. The model can be easily understood Model I could be used to compare any two healthcare systems. The weights of resources/ performance ratio and inequity index can be adjusted flexibi Model 2 Compared to Model 1, Model 2 is more visual and intuitive. Further development of Model 2 can deal with two indexes not of the same order of magnitude. [EDITORS NOTE: We omit this elaboration. In Muuel 2, the weights of resources/ performance ratio and inequity index are equal数学中国 www.madio.net