apply_market_model      Apply a market model and return a list of
                        'returns' objects.
boehmer                 Boehmer's parametric test (1991).
brown_warner_1980       Brown and Warner parametric test (1980).
brown_warner_1985       Brown and Warner parametric test (1985).
car_brown_warner_1985   Brown and Warner (1985) CAR test.
car_lamb                Lamb's CAR test (1995).
car_nonparametric_tests
                        Returns the result of given event study
                        nonparametric CAR tests.
car_parametric_tests    Returns the result of given event study
                        parametric CAR tests.
car_rank_test           Cowan's CAR test.
corrado_sign_test       Corrado's sign test (1992).
generalized_sign_test   An event study binomial sign test.
get_prices_from_tickers
                        Get daily prices of securities.
get_rates_from_prices   Calculate rates of return for given prices.
lamb                    Lamb's parametric test (1995).
modified_rank_test      An event study modified rank test.
nonparametric_tests     Returns the result of given event study
                        nonparametric tests.
parametric_tests        Returns the result of given event study
                        parametric tests.
patell                  Patell's parametric test (1976).
prices                  Stock prices of eight major European insurance
                        companies from 2000-01-03 to 2002-01-01
prices_indx             Prices of of EURONEXT 100 index from 2000-01-03
                        to 2001-12-31
rank_test               An event study rank test.
rates                   Rates of returns of eight major European
                        insurance companies from 2000-01-04 to
                        2002-01-01
rates_indx              Rates of returns of EURONEXT 100 index from
                        2000-01-04 to 2001-12-31
returns                 Constructor of an object of S3 class 'returns'.
securities_returns      Returns of eight major insurance companies from
                        2000-01-04 to 2001-12-29
sign_test               An event study simple binomial sign test.
t_test                  An event study t-test.
wilcoxon_test           An event study Wilcoxon signed rank test.
