Comments on: Orientation Axis Testing: 3 http://groklab.org/handhygiene/2009/09/15/orientation-axis-testing-3/ Just another Groklab.org weblog Mon, 28 Nov 2011 02:43:21 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: gthomas http://groklab.org/handhygiene/2009/09/15/orientation-axis-testing-3/comment-page-1/#comment-27 gthomas Mon, 05 Oct 2009 15:46:37 +0000 http://groklab.org/handhygiene/?p=143#comment-27 Why do you say that? Why do you say that?

]]> By: cubrikaska http://groklab.org/handhygiene/2009/09/15/orientation-axis-testing-3/comment-page-1/#comment-26 cubrikaska Mon, 05 Oct 2009 06:45:21 +0000 http://groklab.org/handhygiene/?p=143#comment-26 Esto es poco probable. Esto es poco probable.

]]> By: gthomas http://groklab.org/handhygiene/2009/09/15/orientation-axis-testing-3/comment-page-1/#comment-13 gthomas Wed, 16 Sep 2009 14:46:41 +0000 http://groklab.org/handhygiene/?p=143#comment-13 Sorry, one more thought. Did you compare it to the previous results? Similar or different? Sorry, one more thought. Did you compare it to the previous results? Similar or different?

]]> By: gthomas http://groklab.org/handhygiene/2009/09/15/orientation-axis-testing-3/comment-page-1/#comment-12 gthomas Wed, 16 Sep 2009 14:38:25 +0000 http://groklab.org/handhygiene/?p=143#comment-12 Are the power levels on the std deviation graph right? I'm surprised that power level 10 has a high std dev than power level 5. May be noise, or may be that my hypothesis about a constant noise level is wrong. Are the power levels on the std deviation graph right? I’m surprised that power level 10 has a high std dev than power level 5. May be noise, or may be that my hypothesis about a constant noise level is wrong.

]]> By: gthomas http://groklab.org/handhygiene/2009/09/15/orientation-axis-testing-3/comment-page-1/#comment-11 gthomas Wed, 16 Sep 2009 14:34:25 +0000 http://groklab.org/handhygiene/?p=143#comment-11 Nicely done, Derek. I'm impressed with how quickly you figured this out and got some data! My first thought was that the standard deviation spike might be caused by the low RSSI values at 0 degrees. If the variation is relatively constant, the smaller signal leads to greater standard deviation. I notice that the change in RSSI levels (the slope of the top graph -- kind of) is greatest near zero. Is it possible that small changes in orientation might have caused the standard deviation? I'm guessing no, because you probably had the motes in a fixed physical position during each power-level/orientation condition. Nicely done, Derek. I’m impressed with how quickly you figured this out and got some data!

My first thought was that the standard deviation spike might be caused by the low RSSI values at 0 degrees. If the variation is relatively constant, the smaller signal leads to greater standard deviation.

I notice that the change in RSSI levels (the slope of the top graph — kind of) is greatest near zero. Is it possible that small changes in orientation might have caused the standard deviation? I’m guessing no, because you probably had the motes in a fixed physical position during each power-level/orientation condition.

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