# GEE correlation matrix

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## GEE correlation matrix

 Hey, I'm doing analyses with binary logistic GEE. I was wondering if using "independent" as working correlation structure takes into account the repeated measurements in the data or if this would be the same as using normal logistic regression and ignoring the fact that there are repeated measurements. (My goal is to correct for repeated measurements but I have no assumption regarding the correlation). Thanks! -- Sent from: http://spssx-discussion.1045642.n5.nabble.com/===================== To manage your subscription to SPSSX-L, send a message to [hidden email] (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD
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## Re: GEE correlation matrix

 From the dialog box help...Working Correlation Matrix. This correlation matrix represents the within-subject dependencies. Its size is determined by the number of measurements and thus the combination of values of within-subject variables. You can specify one of the following structures:Independent. Repeated measurements are uncorrelated.AR(1). Repeated measurements have a first-order autoregressive relationship. The correlation between any two elements is equal to rho for adjacent elements, rho2 for elements that are separated by a third, and so on. is constrained so that –1<<1.Exchangeable. This structure has homogenous correlations between elements. It is also known as a compound symmetry structure.M-dependent. Consecutive measurements have a common correlation coefficient, pairs of measurements separated by a third have a common correlation coefficient, and so on, through pairs of measurements separated by m−1 other measurements. For example, if you give students standardized tests each year from 3rd through 7th grade. This structure assumes that the 3rd and 4th, 4th and 5th, 5th and 6th, and 6th and 7th grade scores will have the same correlation; 3rd and 5th, 4th and 6th, and 5th and 7th will have the same correlation; 3rd and 6th and 4th and 7th will have the same correlation. Measurements with separaration greater than m are assumed to be uncorrelated. When choosing this structure, specify a value of m less than the order of the working correlation matrix.Unstructured. This is a completely general correlation matrix.On Mon, Dec 7, 2020 at 6:16 AM spssdummy <[hidden email]> wrote:Hey, I'm doing analyses with binary logistic GEE. I was wondering if using "independent" as working correlation structure takes into account the repeated measurements in the data or if this would be the same as using normal logistic regression and ignoring the fact that there are repeated measurements. (My goal is to correct for repeated measurements but I have no assumption regarding the correlation). Thanks! -- Sent from: http://spssx-discussion.1045642.n5.nabble.com/ ===================== To manage your subscription to SPSSX-L, send a message to [hidden email] (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD -- Jon K Peck[hidden email] ===================== To manage your subscription to SPSSX-L, send a message to [hidden email] (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD
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## Re: GEE correlation matrix

 Thanks Jon:) However, I read through this before already and I'm still not sure about my question and what choosing for 'independent' actually implies! -- Sent from: http://spssx-discussion.1045642.n5.nabble.com/===================== To manage your subscription to SPSSX-L, send a message to [hidden email] (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD