Programming the statistical procedures from SAS

number of observations read versus used in proc glmselect

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number of observations read versus used in proc glmselect

Could anyone please be so kind and explain why the 'number of observations used' could ver be lower than the 'number of observations read' when I use proc glmselect? Thanks!

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Re: number of observations read versus used in proc glmselect

Posted in reply to csetzkorn

You have missing values which are automatically excluded. 

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