Table 3. 
OLS regression analysis of factors affecting prices (TOTAL COST) for all DOAJ-listed journals (JIF journals only)
Model 1Model 2Model 3Model 4Model 5Model 6Model 7Model 8Model 9Model 10Model 11Model 12
Journal Impact Factor 
JIF (LN) 2.808*** (.167)           .629*** (.192) 
Scopus coverage 
Scopus coverage (yes/no)  2.185*** (.199)          .249 (.186) 
Journal language 
English only   [omitted]        [omitted] [omitted] 
Partially English   −3.524*** (.261)        −3.078*** (.295) −1.157*** (.286) 
No English   −4.873*** (.684)        −4.587*** (.665) −1.810** (.619) 
Publisher type 
Large for-profit    [omitted]        [omitted] 
Not-for-profit organization    −3.571*** (.339)        −2.312*** (.323) 
University press    −1.275* (.566)        −.423 (.511) 
Professional association    −3.018*** (.291)        −1.926*** (.309) 
Small for-profit    −.210 (.220)        −.360 (.214) 
College/university    −3.664*** (.300)        −1.569*** (.323) 
Unclassified    −3.059*** (.322)        −1.467*** (.307) 
DOAJ Seal 
DOAJ Seal     2.651*** (.180)       .761*** (.186) 
World Bank geographic region 
East Asia & Pacific      −1.913*** (.504)     −1.431** (.485) −1.748*** (.437) 
Europe & Central Asia      −.050 (.304)     .229 (.287) −.548* (.278) 
Latin America & Caribbean      −3.444*** (.399)     .234 (.535) −.427 (.485) 
Middle East & North Africa      −3.762*** (1.064)     −3.139** (1.014) −3.340*** (.899) 
North America      [omitted]     [omitted] [omitted] 
South Asia      −2.944*** (.648)     .250 (1.673) −1.107 (1.486) 
Sub-Saharan Africa      −2.972*** (.730)     −.824 (.786) −.346 (.706) 
World Bank economic region 
High income       [omitted]    [omitted] [omitted] 
Low income       5.431* (2.182)    −5.312* (2.264) −3.048 (1.997) 
Lower middle income       −2.845*** (.571)    −3.326* (1.582) −1.794 (1.392) 
Upper middle income       −3.027*** (.244)    −1.638*** (.366) −.723* (.330) 
Peer review duration 
Average peer review weeks        .041 (.031)    .027 (.025) 
Average peer review weeks (squared)        −.002*** (.001)    −.001* (.000) 
Journal size 
Total 2018 publications (log)         .872*** (.077)   .456*** (.073) 
Journal subject 
Medicine          [omitted]  [omitted] 
Interdisciplinary          −1.480*** (.338)  .514 (.292) 
Social Sciences & Humanities          −2.999*** (.298)  −1.006*** (.274) 
Natural Sciences          −.957*** (.204)  −.429* (.172) 
Constant 1.961*** (.194) 3.321*** (.168) 5.408*** (.094) 6.119*** (.131) 3.893*** (.180) 5.493*** (.286) 5.431*** (.098) 5.215*** (.354) .933** (.365) 5.748*** (.145) 5.599*** (.269) 3.579*** (.571) 
R-squared .188 .090 .156 .221 .152 .132 .126 .083 .096 .081 .236 .424 
n 1221 1220 1221 1221 1221 1221 1221 1221 1198 1218 1221 1195 
Model 1Model 2Model 3Model 4Model 5Model 6Model 7Model 8Model 9Model 10Model 11Model 12
Journal Impact Factor 
JIF (LN) 2.808*** (.167)           .629*** (.192) 
Scopus coverage 
Scopus coverage (yes/no)  2.185*** (.199)          .249 (.186) 
Journal language 
English only   [omitted]        [omitted] [omitted] 
Partially English   −3.524*** (.261)        −3.078*** (.295) −1.157*** (.286) 
No English   −4.873*** (.684)        −4.587*** (.665) −1.810** (.619) 
Publisher type 
Large for-profit    [omitted]        [omitted] 
Not-for-profit organization    −3.571*** (.339)        −2.312*** (.323) 
University press    −1.275* (.566)        −.423 (.511) 
Professional association    −3.018*** (.291)        −1.926*** (.309) 
Small for-profit    −.210 (.220)        −.360 (.214) 
College/university    −3.664*** (.300)        −1.569*** (.323) 
Unclassified    −3.059*** (.322)        −1.467*** (.307) 
DOAJ Seal 
DOAJ Seal     2.651*** (.180)       .761*** (.186) 
World Bank geographic region 
East Asia & Pacific      −1.913*** (.504)     −1.431** (.485) −1.748*** (.437) 
Europe & Central Asia      −.050 (.304)     .229 (.287) −.548* (.278) 
Latin America & Caribbean      −3.444*** (.399)     .234 (.535) −.427 (.485) 
Middle East & North Africa      −3.762*** (1.064)     −3.139** (1.014) −3.340*** (.899) 
North America      [omitted]     [omitted] [omitted] 
South Asia      −2.944*** (.648)     .250 (1.673) −1.107 (1.486) 
Sub-Saharan Africa      −2.972*** (.730)     −.824 (.786) −.346 (.706) 
World Bank economic region 
High income       [omitted]    [omitted] [omitted] 
Low income       5.431* (2.182)    −5.312* (2.264) −3.048 (1.997) 
Lower middle income       −2.845*** (.571)    −3.326* (1.582) −1.794 (1.392) 
Upper middle income       −3.027*** (.244)    −1.638*** (.366) −.723* (.330) 
Peer review duration 
Average peer review weeks        .041 (.031)    .027 (.025) 
Average peer review weeks (squared)        −.002*** (.001)    −.001* (.000) 
Journal size 
Total 2018 publications (log)         .872*** (.077)   .456*** (.073) 
Journal subject 
Medicine          [omitted]  [omitted] 
Interdisciplinary          −1.480*** (.338)  .514 (.292) 
Social Sciences & Humanities          −2.999*** (.298)  −1.006*** (.274) 
Natural Sciences          −.957*** (.204)  −.429* (.172) 
Constant 1.961*** (.194) 3.321*** (.168) 5.408*** (.094) 6.119*** (.131) 3.893*** (.180) 5.493*** (.286) 5.431*** (.098) 5.215*** (.354) .933** (.365) 5.748*** (.145) 5.599*** (.269) 3.579*** (.571) 
R-squared .188 .090 .156 .221 .152 .132 .126 .083 .096 .081 .236 .424 
n 1221 1220 1221 1221 1221 1221 1221 1221 1198 1218 1221 1195 
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