# Procrustes scaling option in optimization (extra calculation?)
**URL:** https://shapeworks.discourse.group/t/procrustes-scaling-option-in-optimization-extra-calculation/214
**Category:** Uncategorized
**Created:** [March 11, 2024, 11:36am UTC](https://shapeworks.discourse.group/t/procrustes-scaling-option-in-optimization-extra-calculation/214 "2024-03-11T11:36:24Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Yuyoung](https://shapeworks.discourse.group/u/Yuyoung)
#### Post date: [March 11, 2024, 11:36am UTC](https://shapeworks.discourse.group/t/procrustes-scaling-option-in-optimization-extra-calculation/214/1 "2024-03-11T11:36:24Z")
Hi.
I am currently using ShapeWorks to analyze pubic symphyseal surface data.
I applied “Procrustes scaling” when optimizing but I’ve realized that the aligned pubic symphysis(PS)'s scale is not 1 as the size I got from the mean PS model was similar with the size from the sample data.
So I wonder if there are any extra calculations applied to Procrustes scaling in this software.
ex. multiplying mean to scaled result
Because I am now analyzing the shape variation through comparison of mean models of each group, but I am not sure whether I could simply comprehend my result to as it looks.
Thank you in advance!
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### Author:  [@amorris](https://shapeworks.discourse.group/u/amorris)
#### Post date: [March 11, 2024, 4:36pm UTC](https://shapeworks.discourse.group/t/procrustes-scaling-option-in-optimization-extra-calculation/214/2 "2024-03-11T16:36:59Z")
Using procrustes (scaling and/or rotation/translation) will introduce a “procrustes\_transform” column in the project spreadsheet. This transform will go from local particles to world particles. They are both provided.
If you use only scaling, then the transform should be a simple global scale.