Dear guys,

I have been reading this book: Applied missing data analysis since few days to understand the maximum likelihood calculation.

In page 70, the outcome of covariance matrix which refer from table 3.1 as in the attached picture.

However, after i run the code cov(IQ,Job) using R, the outcome yielded differently as below:   

         IQ               Job

IQ 199.57895 20.526316

Job 20.52632 7.186842

Can anyone here explain any mistake / miss understanding of my code?

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