Statistical source journals are the data sources of CSTPCD. According to the data cited in the literature, several indexes are selected for comprehensive screening and incorporated into natural science.

The selection criteria of statistical source journals are 17, namely:

(1) Total cited frequency;

(2) Influencing factors;

(3) annual indicators;

(4) Self-citation rate;

(5) he cited rate;

(6) price index;

(7) cited half-life;

(8) cited half-life;

(9) Aging coefficient;

(10) Source Doc amount;

(1 1) Number of citations;

(12) average citation rate;

(13) average number of authors;

(14) area allocation number;

(15) Number of institutions;

(16) international paper ratio;

(17) Fund-paper ratio. The impact factor refers to the ratio of the total number of citations of papers published in the first two years of a journal to the total number of papers published in the first two years of the journal. Generally speaking, the greater the impact factor of a journal, the greater its academic influence and role.