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This result stands in contrast to the mathematics teachers' results, with only 25% of the biology teachers' clusters showing high coherence between PCK and CK elements vs. 77% of the mathematics teachers' clusters.
This analysis showed more than 80% coherence between different CK elements within all biology teachers' clusters (100%), but only 25% of the biology teachers' clusters showed high coherence between CK and PCK elements.
But the low coherence between the CK and PCK constructs within most of the mathematics teachers' clusters contrasts with the high coherence that was identified between CK and PCK elements among the same mathematics teachers' clusters.
Each of these teachers' clusters independently demonstrated high coherence (more than 80%) between CK elements and different PCK elements.
One of the mathematics teachers' clusters, Teacher M11, is shown here as a case study (Figure 1).
Taken together, most of the mathematics teachers' clusters showed a high coherence between CK and PCK elements, but a low coherence between CK and PCK constructs.
Similar(48)
Teachers clustered in the profile 'Intermediates' demonstrate conceptions that fit in teacher-centred education as well as in student-centred education.
In contrast, Teacher B9, who was one of the four teachers whose cluster showed high coherence between CK and PCK elements (more than 80%, data not shown) said: 'I need content knowledge but it is not the most important thing in teaching biology.
Our nation's worst teachers are clustered in our poorest neighborhoods, serving our neediest students -- and they have the same tenure protections as our best teachers (I'll bet you can guess which communities they're clustered in...).
Future investigations of the similarities and differences in parent and teacher ratings could conduct latent class analysis on individual items of parent and teacher ratings, to identify whether parents and teachers are observing clusters of behavioural symptoms that fall into comparable groups.
(The most experienced and credentialled teachers have always clustered where they add the least value: in public schools with affluent student bodies).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com