The Culture of Science by Allum Nick. Shukla Rajesh Bauer Martin W

Author:Allum, Nick.,Shukla, Rajesh,Bauer, Martin W.
Language: eng
Format: epub
Publisher: Taylor & Francis (CAM)
Published: 2012-04-14T04:00:00+00:00

RESULTS OF SCALING THE BIOTECHNOLOGY KNOWLEDGE ITEMS

By way of orientation, I present here the results from a two-trait model for the ten items in the British sample, which fits the data well (2.7 per cent of standardised marginal residuals > 4). Figure 14.1 shows the ICCs of what I label the ‘knowledge’ trait for this model. Each plot refers to one of the items, with the value of the latent trait on the horizontal axis and the probability of giving the responses ‘true’, ‘false’, or ‘DK’ on the vertical axis. It can be seen that as one moves from the lower to the higher end of this trait (from lower to higher levels of knowledge), broadly speaking, the probability of giving a correct response increases, and the probability of giving an incorrect or a DK response decreases. The other trait (which is less interesting and not presented here) seems to summarise the tendency to give a DK rather than a substantive response—this is the response effect trait that I expected to find.

Figure 14.1 Item characteristic curves for the ‘knowledge’ trait from a 2-trait discrete trait model for 3-category nominal items, British sample.

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