Redleaf Press: Go Green Rating Scale sample - powered by www.3dissue.com <meta name="Keywords" content="air quality,cleaning products,pests,pesticides,lead,plastics"> <meta name="Description" content="Keep your childhood setting safe from environmental hazards."> <style type="text/css">  </style> <Style> body {overflow-y:hidden;} </style> </head> <body bgcolor="#333333" onResize="window.location=window.location;"> <div id="flashcontent" class="flashcontent"> <object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=8,0,0,0" width="100%" height="100%" id="Go Green Rating Scale sample pages" align="middle"> <param name="allowScriptAccess" value="sameDomain" /> <param name="movie" value="3dissue.swf?myURL=8" /> <param name="quality" value="high" /> <param name="bgcolor" value="#333333" /> <embed src="3dissue.swf?myURL=8" quality="high" bgcolor="#333333" width="100%" height="100%" name="Go Green Rating Scale sample pages" align="middle" allowScriptAccess="sameDomain" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" /> </object></div> <div id="content" class="content">go green rating scale | 5 Reliability and Validity Reliability of measurement addresses how well an instru- ment consistently measures what it purports to measure. The validity of a scale determines how well the scale measures what it purports to measure. reliability Indicators of reliability can be computed by examining internal consistency, test-retest reliability, or inter-rater consistency, depending on the purpose and design of the scale or instrument. Internal consistency reliability reflects the consistency of measurement on different portions of the test or scale. The higher a scale’s internal consistency reliability, the more accurately one can predict performance on any subset of guidelines or items based on the performance of other items. Although an important measure of any scale’s technical merit, it was not anticipated that measures of internal consistency would be that high (approaching 1.0) for the Go Green Rating Scale because, by design, the scales measure many different aspects of the child care environment from air quality to recycling practices. The accuracy of ratings on one scale may or may not predict ratings on other scales. However, two measures of internal consistency reliability—split-half reliability and coefficient alpha—were calculated for the Go Green Rating Scale using scores from the sixty-four guidelines. Split-half reliability was computed between total scores based on the thirty-two odd-numbered guidelines and total scores based on the thirty-two even-numbered guidelines. The resulting correlation was then converted by the Spearman-Brown prophesy formula to an estimate of the reliability coefficient for the full length of the Go Green Rating Scale. The final split-half reliability coeffi- cient was .73. Coefficient alpha is another type of internal consistency reliability. While split-half reliability is based on a par- ticular way of dividing the items into halves (here it was done by odd-numbered guidelines and even-numbered guidelines), coefficient alpha is the average of the results from all possible divisions. Coefficient alpha is a measure of the uniformity or homogeneity of items/guidelines throughout the scale. For the Go Green Rating Scale the alpha was .81. As anticipated, both reliability values dem- onstrate a moderate, but not high, degree of relationship among the various aspects of a child care environment as measured by the sixty-four guidelines of the Go Green Rating Scale. Consistency in measurement over time (test-retest reli- ability) was not computed for the Go Green Rating Scale. By design, the Go Green Rating Scale can also be an intervention tool, that is, something that can be used to improve the greenness of the child care environment and a future rating. Therefore, change or improvement in </div> </body> </html>