3. Methodology and Data
3.1 Methodology
The goal of this study is to analyze the suitability of the FF (1993) model for
the Spanish stock market. Therefore, we focus not on studying the performance of
the model, but on whether this model captures differences in returns caused by differences
in fundamentals. This would give support to the use of this model in non-
-U.S. capital markets.
Following the approach of FF (1995), we analyze if differences in size and
BM determine differences in fundamentals. In this work, we use different measures
of profitability of a firm as proxies for the fundamentals. First, we use the standard
return on assets (ROA) and return on equity (ROE) ratios: