**PURPOSE**- Computes the error probability for each point of an average image resulting from adding a particle series. Inputs are the magnitude of the confidence interval and the variance file. (Source: Haenicke, MPI Goettingen.) Example.

**SEE ALSO****CI**[Confidence Interval] **AS R**[Average image/volume series, optional subset] **EP TT**[T test] **EP TM**[T test - Each Point]

**USAGE**- .OPERATION: EP

- .VARIANCE: STD001

[Enter the name of the file containing the variance of each averaged image point. This is obtained by using operation 'AS R'.].OUTPUT FILE: EPB001

[Enter the name of the file to receive the point-for-point error probabilities associated with the estimated mean for the choice of the confidence interval.].NUMBER OF FILES ADDED: 56

[Enter the number of images added when the average image was formed.].MAGNITUDE OF CONFIDENCE INTERVAL: 0.02

[The magnitude is the actual (not the relative) fluctuation permitted. In the above example, the optical density is allowed to deviate by +/- 0.02 from the theoretical mean.]

**NOTES**

- The numbers obtained are Alpha significance levels.
For an elementary introduction into the theory of
statistical inference, see (e.g.) P. Armitage,
*Statistical Methods in Medical Research*, Blackwell Scientific Publications, p99ff.

**SUBROUTINES**- PROBER, ORCDF

**CALLER**- CONF1

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