| Dependent variables |
IMPACT_FACTOR |
Journal impact factor of the article |
| CITATION |
Number of citations as of December 2010 |
| Grant sponsorship |
FUNDED |
1 if article acknowledged funding award support; 0 if not |
| FUNDERS |
Number of funding sources reported in the article |
| FUNDERS2 |
Squared term of FUNDERS |
| FUND_COUNTRIES |
Number of funding countries reported in the article |
| FUND_COUNTRIES2 |
Squared term of FUND-COUNTRIES |
| EU_FUND |
1 if article acknowledged funding support from European Union (EU) programs; 0 if not |
| US_FUND |
1 if article acknowledged funding support from the US; 0 if not |
| CHINA_FUND |
1 if article acknowledged funding support from China; 0 if not |
| GERMANY_FUND |
1 if article acknowledged funding support from Germany; 0 if not |
| JAPAN_FUND |
1 if article acknowledged funding support from Japan; 0 if not |
| Articles |
ARTICLE_AGE |
Age of the article as of December 2010 (in months) |
| STAR_SCIENTIST |
1 if at least one author is highly cited in 2000–2007; 0 if not |
| AUTHORS |
Number of authors contributing to the article |
| AUTHORS2 |
Squared term of AUTHORS |
| Authoraffiliations |
ACADEMIC |
1 if one author affiliation is university; 0 if not |
| CORPORATE |
1 if one author affiliation is industry; 0 if not |
| GOVLAB |
1 if one author affiliation is a government laboratory or public research center; 0 if not |
| HOSPITAL |
1 if one author affiliation is hospital; 0 if not |
| AFFILIATIONS |
Number of author affiliations in the article |
| AFFILIATIONS2 |
Squared term of AFFILIATIONS |
| Author countries |
US_AUTH |
1 if one author country is the US; 0 if not |
| CHINA_AUTH |
1 if one author country is China; 0 if not |
| GERMANY_AUTH |
1 if one author country is Germany; 0 if not |
| JAPAN_AUTH |
1 if one author country is Japan; 0 if not |
| AUTH_COUNTRIES |
Number of countries in author affiliations |
| AUTH_COUNTRIES2 |
Squared term of AUTH-COUNTRIES |
| Field dummies |
MULTIMATERIAL |
1 if one subject category is multimaterial; 0 if not |
| PHYSCHEM |
1 if one subject category is physical chemistry; 0 if not |
| APPLIEDPHYS |
1 if one subject category is applied physics; 0 if not |
| MULTICHEM |
1 if one subject category is multichemistry; 0 if not |
| NANO |
1 if one subject category is nanoscience/nanotechnology; 0 if not |
| CONDENSPHYS |
1 if one subject category is condensed physics; 0 if not |
| POLYMER |
1 if one subject category is polymer science; 0 if not |
| ATOMICPHYS |
1 if one subject category is atomic physics; 0 if not |
| MULTIPHYSICS |
1 if one subject category is multiphysics; 0 if not |
| ELECTROCHEM |
1 if one subject category is electronic chemistry; 0 if not |
| ANALYTICALCHEM |
1 if one subject category is analytical chemistry; 0 if not |
| BIOCHEMMOLEC |
1 if one subject category is biochemical molecule; 0 if not |
| INORGANICCHEM |
1 if one subject category is inorganic chemistry; 0 if not |
| METALLURGY |
1 if one subject category is metallurgy; 0 if not |
| COATINGS |
1 if one subject category is coatings; 0 if not |
| OPTICS |
1 if one subject category is optics; 0 if not |
