TY - JOUR T1 - On the Influence of Bias and of Personal Equation in Statistics of Ill-Defined Qualities: An Experimental Study JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 77 IS - 517 SP - 337 EP - 339 PY - 1906/03/29/ UR - http://dx.doi.org/10.1098/rspa.1906.0030 M3 - doi:10.1098/rspa.1906.0030 AU - Yule, G. ER -