span_bj                 Britten<e2><80><93>Jones Tangency-Portfolio
                        Spanning Test (1999)
span_f1                 F1 Alpha-Spanning Test (Intercepts Only)
span_f2                 F2 Variance-Spanning Test (Slopes Only)
span_gl_a               Gungor<e2><80><93>Luger Alpha-Only Spanning
                        Test (2016)
span_gl_ad              Gungor<e2><80><93>Luger Joint
                        Mean<e2><80><93>Variance Spanning Test (2016)
span_grs                Gibbons<e2><80><93>Ross<e2><80><93>Shanken
                        (GRS) Alpha Spanning Test (1989)
span_hk                 Huberman<e2><80><93>Kandel Joint
                        Mean<e2><80><93>Variance Spanning Test (1987)
span_km                 Kempf<e2><80><93>Memmel GMVP Spanning Test
span_py                 Pesaran<e2><80><93>Yamagata Alpha Spanning Test
                        (2024)
