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<br />. <br /> <br />PREFACE <br /> <br />. <br /> <br />The series of manuals on techniques describes procedures for planning <br />and executing specialized work in water-resources investigations. The <br />material is grouped under major headings called books and further sub- <br />divided into sections and chapters; section A of Book 4 is on statistical <br />analysis. <br />The unit of publication, the chapter, is limited to a narrow field of <br />subject matter. This format permits flexibility in revisi<)ll and publication <br />as the need arises. <br />Provisional drafts of chapters are distributed to field offices of the <br />U.S. Geological Survey for their use. These drafts are subject to revision <br />because of experience in use or because of advancement in knowledge, <br />techniques, or equipment. After the technique described in a chapter is <br />sufficiently developed, the chapter is published and is sold by the U.S. <br />Geological Survey, 1200 South Eads Street, Arlington, VA 22202 (author- <br />ized agent of Superintendent of Documents, Government Printing Office). <br /> <br />III <br /> <br />. <br />