Simple regression

1.Eisenhofer et al. (1999) investigated the use of plasma normetanephrine and metanephrine for detecting pheochromocytoma in patients with von Hippel-Lindau disease and multiple endocrine neoplasia type 2. The vonHippelLindau.dta data file contains data from this study on 26 patients with von Hippel-Lindau disease and 9 patients with multiple endocrine neoplasia. The dataset has the following data:

p_ne= plasma norepinephrine level (pg/ml)

tumorvol= tumor volume (ml)

disease= 1 if patient has multiple endocrine neoplasia

= 0 if patient has von Hippel-Lindau disease

1.1.Draw a scatter plot of norepinephrine against tumor volume together with the estimated linear regression curve.

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