Summary of hypotheses testing
| Hypothesis | Verbatim | Hypothesis testing | Interpretation |
|---|---|---|---|
| H1 | The higher the JIF of a journal is, the lower it cites predatory journals | Not supported | Citation contamination occurred irrespective of the 2019 JIF value of the citing journal |
| H2 | The higher the CABS rating of a journal is, the lower it cites predatory journals (if any) | Partially supported | Only 4*-rated journals were significantly less contaminated than 2 or 1-rated journals |
| H3 | The greater the age of a journal is, the lower it cites predatory journals | Not supported | Citation contamination occurred irrespective of the age of the citing journal |
| Hypothesis | Verbatim | Hypothesis testing | Interpretation |
|---|---|---|---|
| The higher the JIF of a journal is, the lower it cites predatory journals | Not supported | Citation contamination occurred irrespective of the 2019 JIF value of the citing journal | |
| The higher the CABS rating of a journal is, the lower it cites predatory journals (if any) | Partially supported | Only 4*-rated journals were significantly less contaminated than 2 or 1-rated journals | |
| The greater the age of a journal is, the lower it cites predatory journals | Not supported | Citation contamination occurred irrespective of the age of the citing journal |