Read carefully.
I understand Svend's reference as drawing confidence intervals around
each observed value. I do not want that. I gives a graph that is
difficult to read as many hospitals I want observed value as plots
against a background with confidence limits around the reference value
at increasing numbers on the x-axis.
I will rephrase my question:
How can I draw confidence limits for a reference proportion
(proportion of deaths) at increasing number of operations, from 30 to
400? How can I combine such a graph with plots of observed mortality?
Greetings
Roland Andersson
2007/1/12, Svend Juul <[email protected]>:
Roland Andersson wrote:
I want to draw lines along the x-axis that show the limit
of the 90 and 95% confidence interval for a mortality of 0.15%
at increasing number of operations. I than will plot the
results of each hospital. This will show the widening CI for
the smaller hospitals and the distance from this CI line of each
hospital in relation to the number of operations performed, I have
used "by hospital: ci mortality, poisson" to calculate the CI for
each hospital. I could plot these CI for each hospital to show the
hospitals which has a lower CI above the mean, but I want rather the
CI lines for the mean mortality and plot the hospitals as points.
---------------------------------------------------
I am not sure about the soundness of putting confidence intervals
around both the reference value (0.15%) and the observed values.
Apart from that: I think you might benefit from -statsby-; see
[D] statsby.
Hope this helps
Svend
________________________________________________________
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6
DK-8000 Aarhus C, Denmark
Phone, work: +45 8942 6090
Phone, home: +45 8693 7796
Fax: +45 8613 1580
E-mail: [email protected]
_________________________________________________________
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