[R] Comparing Points on Two Regression Lines

AbouEl-Makarim Aboueissa aaboueissa at usm.maine.edu
Mon Mar 30 22:56:46 CEST 2009

Dear R users:
Suppose I have two different response variables y1, y2 that I regress separately on the different explanatory variables, x1 and x2 respectively. I need to compare points on two regression lines.

These are the x and y values for each lines.


Suppose we need to compare the two lines at the common value of x=13.

Please see attached the method as described in section 18.3 in Jerrold H. Zar.

With many thanks


AbouEl-Makarim Aboueissa, Ph.D.
Assistant Professor of Statistics
Department of Mathematics & Statistics
University of Southern Maine
96 Falmouth Street
P.O. Box 9300
Portland, ME 04104-9300

Tel: (207) 228-8389
Fax: (207) 780-5607
Email: aaboueissa at usm.maine.edu
          aboueiss at yahoo.com


Office: 301C Payson Smith

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