Which statement about the AnalogSummaryHistory column PercentGood is incorrect?

The statement regarding the AnalogSummaryHistory column PercentGood that is identified as incorrect is one that suggests this value is always 100% for valid summarized tags. This is because the PercentGood column is designed to represent the proportion of valid data points collected compared to the total data points available during a specified time interval. Even for tags considered valid, there may be periods where data was missed or compromised due to various factors such as equipment failure, temporary loss of communication, or inaccuracies in measurement.

As a result, it is entirely possible for the PercentGood value to be less than 100%, even when dealing with tags that are generally valid. This underscores the importance of monitoring the PercentGood value to assess the quality and reliability of the collected data over time, rather than assuming that it will always be perfect or fully reliable. In contrast, the other statements accurately reflect the nature of PercentGood in terms of its purpose in assessing data quality, indicating errors when below 100%, and providing insights into the reliability of the source tags.