Use the pooled standard deviation to determine how spread out the individual data points are about their true group mean. Basically, a small standard deviation means that the values in a statistical data set are close to the mean of the data set, on average, and a large standard deviation means that the values in the data set are farther away from the mean, on average. Interpreting Your Data Analysis: How to Determine Statistical Significance. 4. Readers interested to know more about how standard meta-analysis methods work are encouraged to consult the excellent practical review by Fleiss. The pooled effects ... A thoughtful and critical approach to interpreting the results of meta-analysis is important. How to interpret this estimation results Lecture 11 Pooled Cross Sections Panel from ECON 3121 at The Chinese University of Hong Kong The light is finally shining on you from the end of the tunnel, and you are winding down. For other analyses, you can test some of the assumptions before performing the test (e.g., normality, equal variances). An approximate confidence interval for d+ is given with a chi-square statistic and probability of this pooled effect size being equal to zero (Hedges and Olkin, 1985). Interpretation. If I^2 > 50%, the heterogeneity is high, and one should usea random effect model for meta-analysis. However, for regression analysis, the assumptions typically relate to the residuals, which you can check only after fitting the model. When heterogeneity is present the random effects model should be the preferred model. The difference between homogeneity and heterogeneity therefore lies in the different approaches taken to calculate the pooled result. For example, in the following results, the pooled standard deviation for the test scores for all the groups is 8.109. Standard deviation can be difficult to interpret as a single number on its own. The pooled mean effect size estimate (d+) is calculated using direct weights defined as the inverse of the variance of d for each study/stratum. Conducting your data analysis and drafting your results chapter are important milestones to reach in your dissertation process. Regression analysis is interesting in terms of checking the assumption. Robust pooled analysis demonstrating how CTC count may help to optimize treatment choices. By Deborah J. Rumsey . *** So, we’ve reached the end of the ‘how to read … The pooled odds ratio with 95% CI is given both for the Fixed effects model and the Random effects model. (See "How-to-interpret regression output" here for Stata and Excel users). All you need to know about how to interpret the results of a meta analysis in 14 minutes and 15 seconds. ... See Meta-analysis: introduction for interpretation of the heterogeneity statistics Cohran's Q and I 2. 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