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    Analysis for difference in variances between group?

    I have data for 100 different biomarkers. Each biomarker has data for 4 groups (A,B,C,D) with ~2000 observations in each group. I've read a lot about ANOVA but I'm not looking for a difference in means, only a difference in variances between the 4 groups, for each biomarker. I know there is the...
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    linear model of the relationship between two quantitative variables in which the slope coefficient is non-zero.

    I believe C is the correct answer. If the slope coefficient is positive, 1.2 for example, it is telling you there is a positive relationship between x and y, i.e. for every unit increase in x there is a 1.2 times unit increase in y. If the slope coefficient is negative, -1.2 for example, it...
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    Linear modelling

    Hi, I need some help with a modeling query: I have fit 100,000 linear models: M ~ age + age^2, M is the frequency. I found 2,000 models were significant, but would like to narrow it down to find the most ‘extreme’ cases. Is this possible? Does anyone have any suggestions or any references...