Skin cancer campaign evaluation research: technical report (PDF ...

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1.7 Statistical analysisStatistical comparisonsStatistical tests were undertaken to compare the results across the five surveys. Threeseparate sets of comparisons have been conducted in 2009, as illustrated in Figure 1.7.1, whichfocuses on the final phase of campaign activity.Figure 1.7.1 Statistical comparisons undertaken after all six surveysNovember2006February2007November2007February2008February2009February2010Media ActivityMedia ActivityMedia ActivityMedia ActivityProgress to dateCumulative effect of Summer 07/08, 08/09 and 09/10Effect of Summer 09/10Department of Health and AgeingEvaluation of Skin Cancer Campaign | 2010 | PAGE 26
Previous reports contain the results of other statistical comparisons conducted across the firstfour surveys.Figure 1.7.2 Statistical comparisons reported previouslyNovember2006February 2007November2007February 2008February2009MediaMediaMediaImpact of first wave of mediaResidual effect of first wave, controlling forProgress made by FebruaryEffect of second wave of mediaIncremental effect of second wave of media activity, controlling for seasonProgress made by FebruaryEffect of third wave of mediaIncremental effect of third wave of media activity, controlling for seasonFor categorical data, chi-square tests have been used. For ordinal data, Kendall’s tau-b hasbeen employed. In the case of interval data, ANOVA tests have been undertaken to comparemeans, as appropriate.WeightingDuring the analysis, the data were weighted to reflect the geographical distribution of Australia,and also to correct for any gender bias within each target audience. Specifically, there was:1. a weight calculated for gender 3 :The total number of males aged 14-17 years, and the total number of females aged14-17 years, in the Australian population was used to determine how the sample of14-17 year olds should be weighted.The total number of males aged 18-24 years, and the total number of females aged18-24 years, in the Australian population was used to determine how the sample of18-24 year olds should be weighted.2. a weight calculated for location 4 :3 Based on 2001 Australian Bureau of Statistics census data.Department of Health and AgeingEvaluation of Skin Cancer Campaign | 2010 | PAGE 27
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