The 2010 Western Cape graduate destination survey utilised a sequential mixedmode
design in which an initial web survey was augmented with an equivalent
telephonic survey. This article examines mode effect in the Western Cape survey
in terms of overall effect size and the bearing it had on the main outcome of the
study. Standardised residuals and Cramér’s V are used to determine mode effect
across two scenarios, a full sample vs. a subsample, and using two categorical
questions with different numbers of response categories. Overall effect size
appears to be small in the first question, but increases noticeably together with
non-responses in the second question that has many more response categories.
Web responses to alumni or graduate destination surveys can perhaps be augmented
with telephonic responses if necessary, provided response categories are
kept to a minimum, and interviewers are trained properly and monitored for
possible interviewer misbehaviour. The benefit of obtaining larger samples
should then also outweigh the benefit of using web surveys alone.
Thorn, Michelle; Green, Matthew; Bateman, Philip W.; Cameron, Elissa Z.; Yarnell, Richard W.; Scott, Dawn M.(Southern African Wildlife Management Association, 2010-04)
Many carnivores are difficult and labour-intensive to detect, often leading to prohibitively
high effort and cost in large-scale surveys.However,such studies provide information that is
important for effective management ...
Theiler, Gertrud; Du Toit, P.J.(Pretoria : The Government Printer, 1948)
1. The distribution of A. hebraeum has been given in terms of political divisions as well as in terms of vegetational coverage.
2. A. hebraeum is seen to be present in the parklands and in the bushveld of the summer ...
Theiler, Gertrud; Robinson, Britha N.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E.(Published by The Government Printer, Pretoria, 1953)
1. The distribution of Haemaphysalis leachi is given in terms of political
divisions as well as in terms of vegetational coverage.
2. The factor playing the most important role in limiting the spread of
H. leachi appears ...