# calculate upper and lower confidence interval values

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Jules Ray on 1 Apr 2013
Hey dudes...
i have a question about to create confidence intervals from a number of points.
i have a table named "sea", contains 2 rows the first one is the time and the second one is the elevation
sea=
1000 -45
1100 -40
1200 -30
1300 -25
1400 -10
1500 0
1600 -30
1700 -65
1800 -40
1900 -55
2000 -40
what i need is to calculate the upper and lower confidential intervals (99%, 95%, 90% and 60% of confidence), and then plot this intervals using this function.
thanxs in advance for any idea
Tom Lane on 2 Apr 2013
First you should think "confidence intervals for what?" I assume you will treat time as fixed. Are you fitting a model of elevation over time, and you want confidence intervals for parameters of that model? Or are the times just different observations, and you want to fit a probability distribution to the elevation values and compute confidence intervals for parameters of that distribution? Or ...?