Perform analysis on last three values of a FileMaker dataset

问题

My end goal is to have a box change color when the last 3 records input into a field (based on the time of input) in FileMaker achieve a certain criteria (ex. variance < 2). I would like to know how to make this happen, or how a calculation/script can be written to only look at the last 3 records.

回答1:

There are several ways you could approach this. A simple one would be to use a script to:

1. Show all records in the given table;
2. Unsort them (assuming they were entered in chronological order; otherwise sort them by creation timestamp);
3. Omit all records except the last three;
4. Get the value of a summary field defined as Standard Deviation of your value field;
5. Set a global variable/field to the square of the returned value.

Then use the global variable/field to conditionally format your "box".

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If you don't want to use a script, you will have to define a relationship in order to get the last three values in the table, regardless of the current found set and/or sort order. Or you may use the ExecuteSQL() function for this.

来源：https://stackoverflow.com/questions/43793152/perform-analysis-on-last-three-values-of-a-filemaker-dataset