Die deutsche Zigarettenindustrie

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Monograph

Identifikator:: 1028995938

URN:: urn:nbn:de:zbw-retromon-48083

Document type:: Monograph

Author:: Bormann, Kurt http://d-nb.info/gnd/135652758

Title:: Die deutsche Zigarettenindustrie

Place of publication:: Tübingen

Publisher:: Verlag der H. Laupp'schen Buchhandlung

Year of publication:: 1910

Scope:: 1 Online-Ressource (VI, 121 Seiten)

Digitisation:: 2018

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: III. Abschnitt. Die Zigarettenfabrikation

Collection:: Economics Books

VALIDATION OF MEASURING INSTRUMENTS 16 5 steps that may be required in treatment of data, reminding the investigator of essential procedures while referring him to the authorities for more detailed directions, as well as for complete expositions of the statistical theory underlying the formulas recommended. Tabulation. Several points are to be kept in mind in plan- ning the tabulation of the data which have been gathered. The tabulation should put the figures in shape for rapid and convenient statistical treatment and for ease in locating any individual’s record. Rugg describes various ways in which this may be done (157, ch. iii). If there are as many as 20 measures on 1,000 subjects, it will be advisable to resort to a mechanical tabulating device such as the Powers or the Hollerith machine. In tabulating, the investigator should not fail to make use of additional scores which the test may yield, since each new set of scores derived from a different aspect of a test is the equivalent of another test. An illustration of this is found in a study by Manson (106), in which it was discovered that in discriminating between two groups of students the score in an intelligence test was less important than the number of items skipped, a measure which had hitherto been neglected. If the investigator is working with applicants rather than with old employees, it will be necessary to lay the tabulated data aside until reliable figures on the vocational success of the men are at hand. It is sometimes advisable to place in the hands of an executive a duplicate set of the scores. They should be in a sealed envelope so that they will not affect his judgments before the time arrives for a comparison of these data with the records of accomplishment. Reliability. Before proceeding to the presentation of methods of determining the validity of the measuring instru- ments, it is necessary to give some attention to an important step, the determination of the reliability of the measures. The validity of a test is its relationship with the criterion, that is, the proportion of commonality of abilities measured

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