# Exploring the Hjif-Index, an Analogue to the H-Like Index for Journal Impact Factors

^{*}

## Abstract

**:**

## 1. Introduction and Objectives

^{(2)}-index [8], success index [9], A- and AR-indices [10] and R-index [11]. Additional studies have proposed new h-type indices or related them to research evaluation methods [12,13,14,15,16].

- (a)
- To calculate a hjif-index defined in a manner similar to the h-index. This indicator was obtained for each JCR group with two versions of the JIF: the usual one calculated with a 2-year window (JIF2), and a newer one calculated with a five-year window (JIF5).
- (b)
- To explore the distribution of JCR groups according to the two hjif-indices calculated here.
- (c)
- To explore the distribution of JCR groups according to the percentage of journals included in the hjif-core (see below).
- (d)
- To compare the behavior of the hjif-indices based on the JIF2 and the JIF5.

## 2. Method

#### 2.1. Calculation of Hjif-Indices and Hjif-Core

**n**integer intervals on the main y-axis (left). Next, we plotted the usual straight line y = x to obtain the hjif2-index for the ENGINEERING, OCEAN group as the JIF2 corresponding to the journal with the lowest JIF2 above the straight line. In this case, the hjif2-index for this group was 1.175 corresponding to the journal IEEE J OCEANIC ENG.

**n**was the maximum number of different JIFs. However, the hjif-index was not defined here by rank (integer or natural number), but by the JIF related to a given

**n**. There were no upper bounds to the hjif-index because it was defined by the maximum JIF and not by the number of publications.

#### 2.2. Distribution of JCR Groups

## 3. Results and Discussion

#### 3.1. Distribution of JCR Groups According Their Hjif-Index

#### 3.2. Quotient Max(JIF)/Hjif-Index

#### 3.3. Relationship between Hjif5-Index and Hjif2-Index

^{2}= 0.95). For each JCR group, we calculated the hjif5-index—hjif2-index difference. As expected from the above correlation, the distribution of the differences was narrow, with most groups falling within a small range of values. For example, in 153 groups (about 87%) the differences between JI5-index and hjif2-index ranged between −0.100 and 0.600. These results illustrate once again the similarities between the JIF2 and JIF5.

#### 3.4. Distribution of JCR Groups According to the Percentage of Journals in the Hjif-Core

## 4. Conclusions

## Acknowledgments

## Author Contributions

## Conflicts of Interest

## References

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1 | We are indebted to an anonymous referee for this definition. |

**Figure 1.**Top: Calculation of the hjif2-index for the ENGINEERING, OCEAN group (see Table 1). JIFs (secondary y-axis, right) were plotted versus each JIF2 ordinal number (1, 2, 3, ... n). Next, on the primary y-axis (left), the space between zero and the highest JIF2s was divided into

**n**intervals (n = 14). The straight line y = x was plotted and used to obtain the hjif2-index. This hjif2-index is the lowest JIF2 above the line (hjif2-index = 1.175). The hjif2-core includes all journals located above the line. Bottom: Calculation of the hjif2-index for the MULTIDISCIPLINARY SCIENCES group.

**Figure 3.**Distribution of JCR groups according to the Max(JIF2)/hjif2-index (top) and Max(JIF5)/hjif5-index quotient (bottom).

**Figure 4.**Distribution of JCR groups according to the percentage of journals included in the hjif2-core (top) and hjif5-core (bottom).

**Figure 5.**Relationship between the percentage of journals included in the hjif2-core and the hjif2-index (top), and between the percentage of journals included in the hjif5-core and hjif5-index (bottom).

Journal | JIF | N | Difference from the hjif2-Index | H-Core |
---|---|---|---|---|

COAST ENG | 2.428 | 1 | 1.253 | Yes |

COAST ENG J | 2.250 | 2 | 1.075 | Yes |

J ATMOS OCEAN TECH | 1.725 | 3 | 0.550 | Yes |

OCEAN ENG | 1.351 | 4 | 0.176 | Yes |

APPL OCEAN RES | 1.287 | 5 | 0.112 | Yes |

IEEE J OCEANIC ENG | 1.175 | 6 | 0.000 | Yes |

J WATERW PORT COAST | 0.792 | 7 | −0.383 | |

MAR GEORESOUR GEOTEC | 0.644 | 8 | −0.531 | |

J OFFSHORE MECH ARCT | 0.570 | 9 | −0.605 | |

INT J OFFSHORE POLAR | 0.517 | 10 | −0.658 | |

MAR TECHNOL SOC J | 0.434 | 11 | −0.741 | |

CHINA OCEAN ENG | 0.344 | 12 | −0.831 | |

P I CIVIL ENG-MAR EN | 0.312 | 13 | −0.863 | |

SEA TECHNOL | 0.101 | 14 | −1.074 |

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**MDPI and ACS Style**

Cabos, W.; Campanario, J.M.
Exploring the Hjif-Index, an Analogue to the H-Like Index for Journal Impact Factors. *Publications* **2018**, *6*, 14.
https://doi.org/10.3390/publications6020014

**AMA Style**

Cabos W, Campanario JM.
Exploring the Hjif-Index, an Analogue to the H-Like Index for Journal Impact Factors. *Publications*. 2018; 6(2):14.
https://doi.org/10.3390/publications6020014

**Chicago/Turabian Style**

Cabos, William, and Juan Miguel Campanario.
2018. "Exploring the Hjif-Index, an Analogue to the H-Like Index for Journal Impact Factors" *Publications* 6, no. 2: 14.
https://doi.org/10.3390/publications6020014