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October 19th, 2017, 09:44 AM  #1 
Newbie Joined: Dec 2012 Posts: 17 Thanks: 0  Interpreting a confusion matrix
Hi all, I'm trying to interpret a confusion matrix, but I'm having difficulties as it is very confusing to me. Who can help? Which is correct? (a) Of the actual bare soil pixels (125), 69 of them are wrongly classified as residential. This is an omission or commission error? (b) Of the actual bare soil pixels (125), 69 should have been residential pixels. This is an omission or commission error? (a) Of the predicted grassland pixels (213), 45 of them are wrongly classified as open vegetation. This is an omission or commission error? (b) Of the predicted grassland pixels (213), 45 should have been open vegetation pixels. Thanks a lot! 
October 19th, 2017, 02:12 PM  #2 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,261 Thanks: 894 
I have never seen the phrase "confusion matrix"! But, generally, "an error of commission" is something that is done, "an error of omission" is something that was not done. Given that, I would say that "wrongly classifying" as "residential" is an error of commission since a specific act, "classifying as residential" was incorrect. But when pixels that "should have been residential pixels" means that the error is that a specific thing, "classifying them as residential pixels" was not done that is an error of omission.


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