From 8996392794057231a70cd53f506b481200312f0e Mon Sep 17 00:00:00 2001
From: "J.-S. Caux" <J.S.Caux@uva.nl>
Date: Wed, 27 Jun 2018 06:41:43 +0200
Subject: [PATCH] Add citedby impact factor calculation for journal
---
journals/models.py | 17 +++++++++++++++++
stats/templates/stats/statistics.html | 3 +++
stats/views.py | 1 +
3 files changed, 21 insertions(+)
diff --git a/journals/models.py b/journals/models.py
index b3736a50e..c27612810 100644
--- a/journals/models.py
+++ b/journals/models.py
@@ -158,6 +158,23 @@ class Journal(models.Model):
deltat += (pub.latest_citedby_update.date() - pub.publication_date).days
return (ncites * 365.25/deltat)
+ def citedby_impact_factor(self, year):
+ """
+ Computes the impact factor for a given year YYYY, from Crossref cited-by data.
+ This is defined as the total number of citations in year YYYY
+ for all papers published in years YYYY-1 and YYYY-2, divided
+ by the number of papers published in year YYYY.
+ """
+ publications = self.get_publications().filter(
+ models.Q(publication_date__year=year-1) | models.Q(publication_date__year=year-2))
+ nrpub = publications.count()
+ if nrpub == 0:
+ return 0
+ ncites = 0
+ for pub in publications:
+ if pub.citedby and pub.latest_citedby_update:
+ ncites += len(pub.citedby)
+ return ncites/nrpub
class Volume(models.Model):
"""
diff --git a/stats/templates/stats/statistics.html b/stats/templates/stats/statistics.html
index 1e45058b4..a144617d1 100644
--- a/stats/templates/stats/statistics.html
+++ b/stats/templates/stats/statistics.html
@@ -42,6 +42,9 @@
{% if journal %}
<h2>Results:</h2>
+ {% if year %}
+ <h3>Impact factor (Cited-by) for {{ year }}: {{ citedby_impact_factor }}</h3>
+ {% endif %}
<table class="table">
<tr>
<th>DOI label</th>
diff --git a/stats/views.py b/stats/views.py
index 4e2de0c8b..1d79d329c 100644
--- a/stats/views.py
+++ b/stats/views.py
@@ -22,6 +22,7 @@ def statistics(request, journal_doi_label=None, volume_nr=None, issue_nr=None, y
context['journal'] = journal
if year:
context['year'] = year
+ context['citedby_impact_factor'] = journal.citedby_impact_factor(year)
submissions = Submission.objects.filter(
submitted_to_journal=journal_doi_label).originally_submitted(
datetime.date(int(year), 1, 1), datetime.date(int(year), 12, 31))
--
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