As a metric, he calculated article half-lives, or how long it took to reach one-half of a paper's total downloads.
Nevertheless, it would be good to calculate article-specific impact factors, even if they would sometimes be negative, for example for papers that never get cited by anybody but the authors themselves, and certainly for retracted papers.
(Jacobs would report distributing 2,620 garments – "large and small, this includes stockings" – during her first four months in Alexandria; of these, she calculated, 920 articles were sold, "from five cents to two dollars, the amount of money received five hundred and thirteen dollars").
Third, journal title changes will result in a theoretic loss of citations, as the IF is calculated utilizing articles published by that journal over the previous two years.
PPI confidence scores are calculated for retrieved articles, and articles are re-ranked based on scores.
A Medical Education Research Study Quality Instrument (MERSQI) score was calculated for included articles.
It was calculated for three articles that were not included into this study.
Disease rates (cervical intraepithelial neoplasia [CIN]2 or greater and CIN3 or greater), sensitivity, and positive predictive value were abstracted or calculated from the articles.
Four articles calculated the cost-effectiveness of nutrition interventions, all set in low- and middle-income countries.
Study results about sensitivity, specificity, LR+, LR-, and reliability were collected (or calculated, if included articles did not provide these data).
