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The National Study of Writing Instruction - University at Albany

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<strong>The</strong> final comparison in Table 11 uses the CCD to estim<strong>at</strong>e the percentage <strong>of</strong> teachers from<br />

various community types. Analyses were limited to regular public schools with any <strong>of</strong> the<br />

grades 6 through 12 and estim<strong>at</strong>ed the number <strong>of</strong> teachers n<strong>at</strong>ionally as the mean FTE <strong>of</strong><br />

classroom teachers for each sector, times the number <strong>of</strong> schools. Using this estim<strong>at</strong>e as the<br />

basis for comparison, the survey sample over-represents teachers from small town and rural<br />

communities, and under represents those from urban communities. <strong>The</strong>refore an additional<br />

weight variable was constructed using the CCD to estim<strong>at</strong>e the total number <strong>of</strong> teachers in each<br />

community type, and combined with the st<strong>at</strong>e weight variable for other analyses.<br />

<strong>The</strong> total sample <strong>of</strong> names and addresses obtained from MDR contained only slightly more<br />

teachers classified as teaching in urban schools than did the sample <strong>of</strong> verified names and<br />

addresses (19.5% versus 18.8%). Since response r<strong>at</strong>es from teachers in urban settings were<br />

slightly higher than the average response r<strong>at</strong>es, the discrepancy in community type between<br />

the final sample <strong>of</strong> responders and n<strong>at</strong>ional p<strong>at</strong>terns suggests th<strong>at</strong> the original sample drawn<br />

from MDR’s lists had similar under-represent<strong>at</strong>ion <strong>of</strong> teachers in urban communities.<br />

33

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