Search PubMed⌕ Search

PubMed · 7405942

Data collection techniques: mail questionnaires.

Abstract

Questionnaire use, construction, content, wording, administration and pretesting are reviewed. Mail questionnaires gather large amounts of information at relatively low costs, but their design and administration affect the usefulness of the results. Many different aspects of a questionnaire survey will influence its effectiveness, including pre-contact and follow-up, cover letters, question sequence, and questionnaire appearance and length. The type of question to use depends on the level of measurement desired, suitability of the response form to the issue surveyed, and the ability of respondents to use and understand the response form. A small sample group should be used to pretest the questionnaire.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

R N Zelnio. 1980. Data collection techniques: mail questionnaires.. https://pubmed.ncbi.nlm.nih.gov/7405942/

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

A new method for introducing amidate linkages in oligonucleotides using phosphoramidite chemistry.

Cyanoethyl-protected phosphotriester links in oligonucleotides made with standard pophosporamidite chemistry were converted to pbosphoramidate linkages during oligonucleotide synthesis on solid support. The cyanoethyl group was removed with piperidine, and the resulting phosphodiester was activated with p-tosyl chloride. An amine nucleophile displaced the tosyl to yield a phosphoramidate linkage.

Methods↗

PBR: a heavy-atom refinement and phasing procedure to reduce phase bias when heavy-atom derivatives contain common sites.

A procedure, called PBR (phase-bias reduction), has been developed to properly refine heavy-atom derivatives and to generate less biased heavy-atom phases when these derivatives contain common heavy-atom sites. Two independent events are obtained by splitting the refinement and phasing calculations into two stages, the first in which one of the derivatives having common sites is used together with the native amplitudes and the second in which both derivatives with common sites are used simultaneously, with one of them being used as the native data set. Improved centroid phases and the corresponding figures of merit are obtained by phase combination. This procedure has been used in the structure determination of the iron-cluster-containing protein -pyruvate-ferredoxin oxidoreductase. When the common heavy-atom sites are properly treated by the PBR procedure, the resulting calculated centroid phases are improved with respect to classical heavy-atom refinement centroid phases where all derivatives are refined together. This leads to improved electron-density distributions, since anomalous difference Fourier maps calculated with the PBR-refined centroid phases and corresponding figures of merit show more clearly the positions of the iron sites.

Methods↗