Hi group,

If I generate a simple scatter graph with bi-directional error bars, then

fit a linear regression to the data, when I attempt to view 95 % confidence

intervals they are not visible on the graph?

Thanks in advance.

James

Hi group,

If I generate a simple scatter graph with bi-directional error bars, then

fit a linear regression to the data, when I attempt to view 95 % confidence

intervals they are not visible on the graph?

Thanks in advance.

James

1. several regression curves + confidence bands in one graph

Dear all,

I would like to depict several regression curves plus the confidence

bands/curves in one graph. This seems to be impossible using the INSIGHT

('clicking') environment. What I end up with are three graphs for each

of my groups.

Here are some more details. The data is in 'csv excel' comma separated

format. There are three columns and several rows. The first column X

contains the independent integer values, the second column Y the

dependent integer values whereas the third column indicates the group

membership for each entry. (What is more convinient to indicate the

group membership - a number or a character?)

I am pretty sure that other people must have had the same problem. Could

you possibly provide me with some advice or even some code to prevent me

from re-implementing the wheel?

I am looking forward to hear from you. Many thanks in advance.

Regards,

Chris

PS: The data can be very good approximated using quadratic regression.

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