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Table 3 IV 2SLS estimates of the first stage model, dependent variable: friends in the classroom

From: Introduction to instrumental variables and their application to large-scale assessment data

Predictors Friends (for reading) Friends (for mathematics) Friends (for science)
Distance −0.0027*** (0.0004) −0.0027*** (0.0004) −0.0028*** (0.0004)
PISA 2009 score −0.0005*** (0.0001) −0.0004** (0.0001) −0.0004** (0.0001)
ESCS −0.0240** (0.0101) −0.0240** (0.0102) −0.0249** (0.0102)
Live in the countryside 0.0047 (0.0173) 0.0043 (0.0174) 0.0062 (0.0173)
Type of school
General comprehensive (Reference category)
Vocational with comprehensive program −0.0421* (0.0241) −0.0415* (0.0237) −0.0383 (0.0239)
Basic vocational school 0.0421 (0.0346) 0.0543 (0.0332) 0.0564* (0.0332)
Female −0.0119 (0.0170) −0.0338* (.0177) −0.0278 (0.0172)
N 4951 4951 4951
F (excluded instrument) 41.7518 39.9005 41.821
Adj. R2 0.0272 0.0266 0.0266
  1. Standard errors in parentheses
  2. * p < 0.1; ** p < 0.05; *** p < 0.01