Standard deviation for a stage range

[[Je...]]

Hi GOM Team,

I'd like to edit a cell in the table, in order to calculate statistical parameters for a specific stage range. 

For any project, after the reference image is obtained I capture 10 stages to evaluate measurement noise for each parameter. I then capture further stages to measure deformation etc.

In the table I would like to display the standard deviation for Stage 2 to Stage 11 only.

I have tried the function sigma(result_dimension.measured_value, index='stages'). However, this calculates the standard deviation for all the stages.

Is there a different expression that can be used instead of index='stages' to select a certain stage range?

Many thanks,

Jesse

[[Iv...]]

Hi Jesse,

please check the following FAQ article https://connect.gom.com/x/la3VAg. This may solve your question. 

Greetings, Ivan

[[Je...]]

Hi Ivan,

Thank you for your suggestion. 

I've followed the steps in the link, but there is a problem at Workflow (Step 4). The expression does not accept the term "Range", and only accepts " 'stages' " (see screenshot 'Workflow_step4.png', compared to 'Workflow_step4_alt.png').

Do you know the reason for this?

Many thanks,

Jesse

[[Iv...]]

Hi Jesse,

maybe your Stange Range is wrong. Can you create a new range. Just for 5-10 stages just to check if it's possible.