Measured value analysis apparatus and measured value analysis method

A measured value analysis method for a measured value analysis apparatus for analyzing measured values of a plurality of measurement items,

• wherein a controller executes:
• a step of selecting one examination object item, which is an examination object, and a plurality of related items which are directly or indirectly related to the examination object item;
• a step of creating a correlation model between measured values from past measured values of the examination object item and the plurality of related items;
• a step of calculating predicted values of the plurality of related items by applying the measured values of the plurality of related items to the correlation model and calculating divergence between an actual measured value of each of the related items and the relevant predicted value;
• a step of re-selecting the related items regarding which the calculated divergence between the predicted value and the actual measured value of the plurality of related items is equal to or less than a specified threshold value;
• a step of re-creating the correlation model between the measured values of the examination object item and the plurality of related items in the past, from the measured values;
• and
• a step of calculating a predicted value of the examination object item by applying the measured values of the related items to the correlation model and calculating the divergence between an actual measured value of the examination object item and the predicted value as a measured value of an environmental factor other than the plurality of related items which influence the examination object item.