[R] About regression and plot

[Daniel Yang]

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Dear R-help,

This is my first R day.  I want to ask some more beginner's questions.

Q1. How can I obtain the covariance matrix for parameter estimates of a
multiple regression?  I checked ?lm but didn't get the information.

Q2. How can I see the old graphs in the graph window?

Q3. Can R plot animated graph?  For example, I want to see the dynamic
change of a 2D graph during a time period.

Thanks in advance!
Yung-jui Yang