Why don't the logger statistics agree with the statistics in the report?

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Common Problems > Why don't the logger statistics agree with the statistics in the report?

G4 loggers can display limited statistical information (mean, maximum and minimum values, and the time spent outside the limits) on the LCD display, and this statistical information is also summarized in the statistics report.

 

The parameters time below lower limit, time above upper limit, maximum, minimum, mean, elapsed time, and total markers which are displayed by the logger are all calculated over the samples taken in the trip since the logger started sampling.  If the logger is overwriting and is read with Temprecord, these statistics as reported by Temprecord and those as reported in these screens will not agree, because the samples read from the logger by the Temprecord program do not include those samples lost to overwriting, whereas the statistics displayed by the logger include these "lost" samples.

 

Another reason for differences is rounding.  The data values in the Temprecord program are stored to a precision of 0.01 degrees C, but the statistics displayed on the LCD display comes from calculations which use the values as they were measured in the logger, and these are stored with a higher precision.  As a result the mean values may not agree.

 


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