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Thanks William, I use mixed to run the hierarchical linear model, the variables of level 2 are all the same for each individuals in levle1. For example,...
 11 posts

Thanks William! however I find if drop one of b,c,d, the model will concave, so which should I drop?...
 11 posts
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tuples:observation numbers out of range
when the items are more than 10, it will cause the problem of observation numbers out of range, can we first store or output the results and then continue...
 2 posts


error obtaining scores for robust variance
Code:mixed y cl.x##c.w age edu i.ind  id:cl.x, vce(robust) cov(exc)
https://www.dropbox.com/s/oef3hk8ui8rquu...
 2 posts



mixed not concave
In order to replicate the problem of not concave, the data is uploaded:https://www.dropbox.com/s/k45ns53rte...ample.dta?dl=0
Here is the code,...
 11 posts

why when I use the from option of mixed, the Stata shows that option from() not allowed
thanks...
 7 posts
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Fred Lee replied to how to examine the moderating effect and plot the figure when iv is categorical variable and moderator is continuous variablein Generalcan anyone explain more about the differences about such codes below?
margins x, predict(xb) at(w = (`min' `max'))
margins x, at(w = (`min'...
 5 posts
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I have read this tips but have no solutions, can you give me an example using the code above?...
 8 posts
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Code:* Example generated by dataex. To install: ssc install dataex clear input byte cashDividend01 double ChairCEO byte totalTMT
 8 posts
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putting the legend to the bottom layer
How to do that?...Last edited by Fred Lee; 18 May 2019, 01:02.
 8 posts
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