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Journal of Population Sciences

Table 4 Model coefficients for Model 1, Model 2, Model 3 and Model 4a

From: Italian PhD students at the borders: the relationship between family background and international mobility

 

Model 1

Model 2

Model 3

Model 4

Coeff.

std error

p value

Coeff.

std error

p value

Coeff.

std error

p value

Coeff.

std error

p value

a) Facultative and financed stay

 Parental education (ref. upper secondary)

  Primary

−0.606

0.057

0.000

−0.543

0.052

0.000

−0.577

0.048

0.000

−0.385

0.013

0.000

  Lower secondary

−0.108

0.041

0.008

−0.064

0.043

0.131

−0.098

0.046

0.033

−0.026

0.052

0.612

  Tertiary/post-tertiary

0.071

0.032

0.028

0.037

0.030

0.231

0.080

0.021

0.000

0.109

0.020

0.000

  Unknown

−0.901

0.213

0.000

−0.826

0.241

0.001

−0.741

0.255

0.004

−0.863

0.230

0.000

 Mother’s economic activity (ref. employed/self-employed)

  Homemaker

   

−0.206

0.007

0.000

−0.202

0.009

0.000

−0.135

0.012

0.000

  Retired

   

−0.060

0.014

0.000

−0.049

0.013

0.000

−0.043

0.014

0.002

  Other conditions

   

−0.172

0.060

0.004

−0.140

0.063

0.026

−0.114

0.059

0.052

 Father’s social class (ref. lower-grade prof)

  Higher-grade professionals

      

−0.126

0.029

0.000

−0.099

0.039

0.010

  Routine non-manual

      

−0.002

0.046

0.966

−0.001

0.049

0.977

  Self-employed

      

0.003

0.024

0.892

−0.006

0.048

0.895

  Working class (skilled/unskilled)

      

0.121

0.017

0.000

0.053

0.026

0.044

  Unknown social class

      

−0.152

0.025

0.000

−0.069

0.017

0.000

 Gender (ref. male)

  Female

         

−0.196

0.047

0.000

 Scholarship (ref. full scholarship)

  Partial scholarship

         

−0.523

0.089

0.000

  Research grant

         

−0.878

0.048

0.000

  Other grants from university

         

−0.832

0.095

0.000

  Earnings outside university

         

−1.915

0.037

0.000

  No source of earnings

         

−1.348

0.082

0.000

 Macro-area of athenaeum (ref. north)

  Centre

         

−0.347

0.048

0.000

  South/Islands

         

−0.394

0.140

0.005

 Interregional move for PhD studies (ref. no)

  Yes

         

0.151

0.094

0.107

 Year of defence (ref. 2008)

  2010

         

0.049

0.078

0.528

  2012

         

0.073

0.088

0.410

  2014

         

0.138

0.099

0.162

 Field of study (ref. Science and Engineering)

  Life Science

         

−0.560

0.010

0.000

  Social Science and Humanities

         

−0.168

0.013

0.000

 Constant

−0.863

0.191

0.000

−0.783

0.195

0.000

−0.781

0.192

0.000

0.169

0.112

0.132

b) Facultative and non-financed stay

 Parental education (ref. upper secondary)

  Primary

−0.246

0.040

0.000

−0.223

0.054

0.000

−0.199

0.076

0.009

−0.214

0.073

0.003

  Lower secondary

−0.005

0.062

0.938

0.013

0.068

0.855

0.038

0.044

0.381

0.037

0.053

0.476

  Tertiary/post-tertiary

0.199

0.043

0.000

0.183

0.051

0.000

0.114

0.039

0.003

0.079

0.034

0.019

  Unknown

−0.486

0.480

0.311

−0.551

0.492

0.263

−0.473

0.491

0.336

−0.495

0.566

0.382

 Mother’s economic activity (ref. employed/self-employed)

  Homemaker

   

−0.083

0.058

0.147

−0.091

0.057

0.109

−0.084

0.050

0.091

  Retired

   

0.077

0.013

0.000

0.074

0.015

0.000

0.020

0.037

0.593

  Other conditions

   

0.070

0.023

0.003

0.100

0.008

0.000

0.096

0.011

0.000

 Father’s social class (ref. lower-grade prof)

  Higher-grade professionals

      

0.187

0.038

0.000

0.170

0.025

0.000

  Routine non-manual

      

−0.129

0.122

0.289

−0.124

0.107

0.245

  Self-employed

      

0.038

0.129

0.768

0.015

0.121

0.899

  Working class (skilled/unskilled)

      

−0.062

0.102

0.546

−0.055

0.090

0.542

  Unknown social class

      

−0.132

0.113

0.244

−0.174

0.104

0.096

 Gender (ref. male)

  Female

         

−0.204

0.122

0.094

 Scholarship (ref. full scholarship)

  Partial scholarship

         

0.240

0.027

0.000

  Research grant

         

0.526

0.102

0.000

  Other grants from university

         

0.521

0.037

0.000

  Earnings outside university

         

0.253

0.227

0.265

  No source of earnings

         

0.443

0.123

0.000

 Macro-area of athenaeum (ref. north)

  Centre

         

−0.090

0.062

0.147

  South/Islands

         

−0.144

0.061

0.018

 Interregional move for PhD studies (ref. no)

  Yes

         

0.383

0.053

0.000

 Year of defence (ref. 2008)

  2010

         

−0.023

0.043

0.583

  2012

         

0.182

0.102

0.073

  2014

         

0.184

0.096

0.055

 Field of study (ref. Science and Engineering)

  Life Science

         

−0.089

0.019

0.000

  Social Science and Humanities

         

0.610

0.039

0.000

 Constant

−2.058

0.262

0.000

−2.037

0.279

0.000

−2.033

0.269

0.000

−2.199

0.197

0.000

  Log-likelihood

−24,080.4

−24,057.7

−24,031.9

−22,411.6

  AIC

48,164.7

48,119.4

48,069.8

44,827.2

  BIC

48,181.2

48,135.9

48,094.6

44,843.7

  1. aModel 1, Model 2, Model 3 and Model 4 are multinomial logistic models with random errors clustered at the field of study (the response variable is about international mobility during PhD studies with three categories—where the reference category is the student who remained in Italy), and they differ only for the control variables included in the four model specifications