# Evoked error

**URL:** <https://mne.discourse.group/t/evoked-error/2134>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [April 3, 2020, 3:57pm UTC](https://mne.discourse.group/t/evoked-error/2134 "2020-04-03T15:57:59Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [April 3, 2020, 3:57pm UTC](https://mne.discourse.group/t/evoked-error/2134/1 "2020-04-03T15:57:59Z")

</div>

External Email - Use Caution

Dear experts:

I am processing egg data. I need to do epochs.average() but it says like epochs is empty and it makes no sense to do average. When I do mne.Epochs I find that not all the channels were dropped. Depending on the event\_id= dict(aud=id1).

Sincerely,  
Andrade.

> > > epochs

\<Epochs | 0 events (all good), -0.199219 - 0.5 sec, baseline [None, 0], ~161 kB, data loaded,  
'read': 0\>

> > > events

array([[18275, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[19387, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[20422, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[32156, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[46029, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[46873, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[47522, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[72924, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[73666, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[74230, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[92717, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[94025, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[94590, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[108211, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[109532, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[110110, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[130866, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[131605, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[132900, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[156301, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[157153, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[157843, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[176353, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[177182, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[177821, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[191436, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[192495, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[193129, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[233638, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[234323, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[234936, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[248375, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[249218, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[249817, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[255773, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[256493, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[257060, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[286302, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[287009, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[287601, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[320684, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[321413, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[340579, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[341369, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[342650, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[383286, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[384166, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[384810, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[406476, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[407297, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[407956, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[409017, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[444348, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[445107, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[445683, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[446969, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[482043, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[482761, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[483421, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[521536, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[522365, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[523009, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[535415, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[536091, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[536691, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[573609, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[574341, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[574916, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[588192, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[588973, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[589524, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[611318, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[612110, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[612703, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[613416, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[634153, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[635029, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[635592, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[636193, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[662819, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[663674, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[664355, 0, 4],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[665003, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[677292, 0, 128],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[678266, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[678926, 0, 2],  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[679619, 0, 2]])  
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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [April 3, 2020, 4:36pm UTC](https://mne.discourse.group/t/evoked-error/2134/2 "2020-04-03T16:36:47Z")

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External Email - Use Caution

When you create your epochs, include the parameter preload=True, then you will see in the output which epochs are getting dropped based on your reject criteria. Probably your criteria are too stringent, that's why it says \<Epochs | 0 events ...\>. Here "0 events" means all epochs were rejected. See also epochs.plot\_drop\_log().

-- dan  
Daniel McCloy  
[https://dan.mccloy.info](https://dan.mccloy.info)  
Research Scientist  
Institute for Learning and Brain Sciences  
University of Washington

??? Original Message ???

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [April 14, 2020, 12:37pm UTC](https://mne.discourse.group/t/evoked-error/2134/3 "2020-04-14T12:37:43Z")

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External Email - Use Caution

Sorry I didn?t answer I had all emails in spam but I received some normally so I didn?t check for spam. Can you tell me how to know if parameters are too strict or not? How can I know how to set proper parameters? Is there any tutorial to know proper criteria?

Sincerely,  
Andrade.

---

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [April 14, 2020, 4:16pm UTC](https://mne.discourse.group/t/evoked-error/2134/4 "2020-04-14T16:16:18Z")

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External Email - Use Caution

The answer is exactly the same as [the last time you asked]([https://mail.nmr.mgh.harvard.edu/pipermail//mne\_analysis/2020-April/006681.html](https://mail.nmr.mgh.harvard.edu/pipermail//mne_analysis/2020-April/006681.html)): read [this tutorial section]([https://mne.tools/dev/auto\_tutorials/preprocessing/plot\_20\_rejecting\_bad\_data.html#rejecting-epochs-based-on-channel-amplitude](https://mne.tools/dev/auto_tutorials/preprocessing/plot_20_rejecting_bad_data.html#rejecting-epochs-based-on-channel-amplitude)). In particular, I call your attention to this sentence: "The values that are appropriate are dataset- and hardware-dependent, so some trial-and-error may be necessary to find the correct balance between data quality and loss of power due to too many dropped epochs."

-- dan  
Daniel McCloy  
[https://dan.mccloy.info](https://dan.mccloy.info)  
Research Scientist  
Institute for Learning and Brain Sciences  
University of Washington

??? Original Message ???