Fig. 4
Results of correspondence analysis of hospitals performing cardiac surgery
n = 1013 Fig. 4 illustrates the results of correspondence analysis of hospitals that performed cardiac surgery. Measures that are close together indicate measures with similar ratings and measures that are close to ratings represent combinations that occur more frequently. η12 and η22 near the axes denote the eigenvalues of the first (horizontal) axis and the second (vertical) axis respectively. The total sum of the eigenvalues 0.04 = 0.03 + 0.01. The contribution ratio of the first axis, γ1 0.75 = 0.03/0.04 and of the second axis, γ2 0.25 = 0.01/0.04, which means the first axis explains 75% of the variance in the data and the second 25%. In other words, the first two axes account for 100% of the variance of the data. The circles correspond to the clusters in Fig. 2. Measures in the better-rated cluster of doctor communication, nurse communication, pain management, cleanliness and two global evaluation measures were placed closely around “High” and far from “Medium” and “Low,” indicating the six measues received relatively similar better scores. In the other poorly rated cluster, quietness and staff responsiveness were the closest to “Medium” and medication explanation the closest to “Low”
Revised from Fig. 3 in Okuda M, Yasuda A, Tsumoto S. Factors of Patient Satisfaction based on distant analysis in HCAHPS Databases, IEEE International Workshop on Data Mining for Service (DMS2014), Shenzhen, China, December 14, 2014 [36]