Page:The Philadelphia Negro A Social Study.djvu/51

Sect. 3.] the statistical method, to even greater error from the methods of general observation, and, above all, he must ever tremble lest some personal bias, some moral conviction or some unconscious trend of thought due to previous training, has to a degree distorted the picture in his view. Convictions on all great matters of human interest one must have to a greater or less degree, and they will enter to some extent into the most cold-blooded scientific research as a disturbing factor.

Nevertheless here are social problems before us demanding careful study, questions awaiting satisfactory answers. We must study, we must investigate, we must attempt to solve; and the utmost that the world can demand is, not lack of human interest and moral conviction, but rather the heart-quality of fairness, and an earnest desire for the truth despite its possible unpleasantness.

In a house-to-house investigation there are, outside the attitude of the investigator, many sources of error: misapprehension, vagueness and forgetfulness, and deliberate deception on the part of the persons questioned, greatly vitiate the value of the answers; on the other hand, conclusions formed by the best trained and most conscientious students on the basis of general observation and inquiry are really inductions from but a few of the multitudinous facts of social life, and these may easily fall far short of being essential or typical.

The use of both of these methods which has been attempted in this study may perhaps have corrected to some extent the errors of each. Again, whatever personal equation is to be allowed for in the whole study is one unvarying quantity, since the work was done by one investigator, and the varying judgments of a score of census-takers was thus avoided.