Page 174 - JOURNAL OF LIBRARY SCIENCE IN CHINA 2018 Vol. 42

YU Houqiang，Bradley M. Hemminger，XIAO Tingting & QIU Junping / Features of Sina Weibo altmetrics indicator 173

w3
P i represent the percentage of articles that have lower altmetrics score than S i in the whole dataset
J
in latest 3 months, P i represent the percentage of articles that have lower altmetrics score than S i in
the same journal, and P i represent the percentage of articles that have lower altmetrics score than
J3
S i in the same journal in latest 3 months. Meanwhile, let M i represent the mean value of altmetrics
w
w3
score of articles in the whole dataset, M i represent the mean value of altmetrics score of articles
J
in the whole dataset in the latest 3 months, M i represent the mean value of altmetrics score of
J3
articles in the same journal, M i represent the mean value of altmetrics score of articles in the same
J
w3
w
journal in the latest 3 months. We divided S i by M i , M i , M i , M i respectively and got T i , T i , T i ,
J
w3
J3
w
J3
T i , which meant the times of over the mean value. These percentage and times data were used to
describe the overall performance of Weiboed articles, as shown in Table 5. In addition, these 8 data
series were drawn into lines in Figure 8.
Table 5. Altmetrics score of Weiboed articles compared with the other articles
W W3 J J3 W W3 J J3
P i P i P i P i T i T i T i T i
Mean 86.98% 86.08% 82.39% 70.86% 23.24 15.42 19.41 22.36
P. over mean 91.43% 92.04% 88.60% 76.49% 1 1 1 93.86%
Min. 25.37% 19.46% 5.26% 1.19% 22.65 11.69 1.07 0.01
Max. 100% 100% 100% 99.99% 25.34 31.82 258.87 483.16

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Figure 8. Altmetrics score of Weiboed articles compared with the other articles.
Table 5 showed that Weiboed articles, compared with other articles, had much higher level
altmetrics score. To be specific, compared with articles in the whole dataset, altmetrics score of
Weiboed articles were on average higher than that of 86.98% of all the articles, and 23.24 times