Jump to content

Datalogger Histograms


Recommended Posts

Ignore will hide any cells with a cell count < "samples".

Filter will drop any samples from the bucket where the standard deviation is outside of "std dev".

Standard deviation is very useful to determine if you have highly non correlated or bad data. It is also great for filtering out noise due to transient data or slow logging rates.

I did a write up on it here a long time ago.


Basically the short of it is your Z data should be highly correlated with your X and Y data, eg all the values collected are roughly the same, eg the min/max are very close together.

If you had 1000 samples within a specific cell, all are roughly 0->0.1 and then 20 random samples is 1000 due to a sensor fault, the 1000 would have a huge standard deviation and the value would be dropped. This would also be excluded from the average value calculation.



The number at the bottom is the standard deviation. So if you want to drop transient data from your log and only use the steady state data you might use a tight standard deviation of 1. If you want the extreme min/maxs you might go as high as 3.

  • Like 1
  • Thanks 2
Link to comment
Share on other sites

30 minutes ago, Roland@pcmtec said:

Unfortunately Matt has moved on to another job so datalogger development will likely be halted until we can afford more employees. We will continue to fix bugs however there won't be any new major features in the short term. 

thank you for the honest reply

  • Like 1
Link to comment
Share on other sites

13 hours ago, Puffwagon said:

What does someone need to learn and how long to learn it before they'd be any good as an intern?

Have 5 years of prior programming experience and either a bachelors in computer science or engineering.

Most of us have 15+ years experience writing software. Darryl started in the 80s and you could say he has 40+

You actually don't need to know anything about cars to do most of what we do. Definitely helps if you do though! 

  • Like 3
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...