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From |
"Ben Dwamena" <bdwamena@med.umich.edu> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: How may I compute standard errors and/or confidence intervalsfor the following functions |

Date |
Sun, 09 Dec 2007 00:47:00 -0500 |

Dear Statalisters, I am working with normally distributed test results in patients with and without a disease condition related to alpha (accuracy parameter) and beta (threshold parameter) such that: alpha = (2*pi/sqrt(3))*[ (mu_nd - mu_d)/(sigma_nd + sigma_d)] beta = (sigma_nd - sigma_d)/(sigma_nd + sigma_d) where mu_nd and sigma_nd are the mean and standard deviation of test results in N_nd non-diseased patients and mu_d and sigma_d are the mean and standard deviation of test results in N_d diseased patients. How may I compute standard errors and/or confidence intervals for alpha and beta? Thanks for your assistance. Ben Ben Adarkwa Dwamena, MD Assistant Professor of Radiology Division of Nuclear Medicine Department of Radiology University of Michigan Health Systems B1G505 UH SPC 5028 1500 E. Medical Center Drive Ann Arbor, MI 48109-5028 bdwamena@umich.edu http://sitemaker.umich.edu/metadiagnosis Staff Physician D748 Nuclear Medicine Service (115), VA Ann Arbor Health Care System 2215 Fuller Road Ann Arbor, MI 48105 734-845-3775 Phone 734-845-3252 Fax ********************************************************** Electronic Mail is not secure, may not be read every day, and should not be used for urgent or sensitive issues * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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