The R-square of the market model is largely employed in finance and accounting studies as a measure of stock price informational efficiency. Individual firms R-squares are usually aggregated at the country-level by using the individual firm total risk over the country total risk as weighting factor. This paper shows how to interpret the country-level R-square as a Chisini mean of the firm-specific R-squares and under what conditions it may be related to the R-square of a Seemingly Unrelated Regression (SUR) model. In particular we show that for the latter a necessary constrain is that returns must be centered on zero, which appears to be in this context not only a common practice but also a methodological assumption.
Original languageEnglish
Pages (from-to)57-66
Number of pages10
JournalElectronic Journal of Applied Statistical Analysis
Publication statusPublished - 2013


  • Chisini mean
  • Informational efficiency
  • Market model
  • R-square
  • SUR model


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