# IMPACT FACTORS

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Category: Education

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### IMPACT FACTORS:

IMPACT FACTORS Two-Year Impact Factor The traditional two-year Impact Factor is based on two years of cited journal content – cites in the current year to journal material published in the prior two years. Five-Year Impact Factor The five-year Impact Factor is based on cites in the current year to journal material published in the prior five years.

### Why two Impact Factors?:

Why two Impact Factors? There can be differences in the pace of citations to a journal, typically journals in the life sciences are cited very rapidly and the citations quickly trail off. However, in fields such as mathematics or general science, it takes longer for the journals to be cited and their impact is extended over a longer period of time. Let’s look at an example of this.

### Slide 3:

In the journal category of GENETICS & HEREDITY , the two-year impact factor tends to be higher than the five-year IF.

### Slide 4:

In the journal category of FORESTRY , the five-year impact factor tends to be higher than the two-year IF. Notice how published research in Forestry takes more time to fully realize its influence than in the field of Genetics and Heredity.

### Impact Factor Calculations:

Impact Factor Calculations The journal Impact Factor is the average number of times articles from the journal published in the past two years have been cited in the JCR year. The Impact Factor is calculated by . . .

### Slide 6:

. . . dividing the number of citations in the JCR year by the total number of articles published in the two previous years. For example, the IF of Nature Genetics is… Here’s the calculation for the Nature Genetics Impact Factor for 2010.

### Impact Factor Calculations:

Impact Factor Calculations The five-year journal Impact Factor is the average number of times articles from the journal published in the past five years have been cited in the JCR year. The Impact Factor is calculated by . . .

### Slide 8:

. . . dividing the number of citations in the JCR year by the total number of articles published in the five previous years. For example, the five-year IF is … Here’s the calculation for the Nature Genetics Five-Year Impact Factor for 2010.

### Impact factors with jcr:

Impact factors with jcr Go to the University Library home page . Go to Journal Citations Report . Return to beginning of tutorial . University of Texas at El Paso University Library