Aug. 8th, 2014

kaberett: Overlaid Mars & Venus symbols, with Swiss Army knife tools at other positions around the central circle. (Default)
Writing myself a list of things to get done in the next ~30 minutes.

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Things I would like to get done but clearly don't have the cope to: get photo onto laptop [tick!], e-mail photo to relevant company (via looking up company contact info) [tick!]; call GP to attempt to rearrange appointment [tick!]; brush hair [tick!]; e-mail supervisor info she's asked for [tick!]; continue trying to work out wtf is going wrong with the server [... semi-tick!].

Things that need to get done today one way or another: getting into work for long enough to clean the labs [tick!]; getting info on xenoliths off my work computer to skim through here [tick!] (I. hate. IMAP.).
kaberett: Euphorbia cf. serrata, green crown of leaves/flowers central to image. (spurge)
I decided this morning that I was sufficiently upset about the vile autism-bashing in a panel description to send an e-mail about it. Within two hours I'd had an actually useful response. Details below the cut!

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kaberett: Photo of a pile of old leather-bound books. (books)
There is a standard ("Aldrich") that I measure ~10 times per mass spectrometry session, to make sure I'm getting approximately the right numbers out. I currently have ~104 measurements of this standard, with a standard deviation of +- 0.45 units.

I also measure samples, with number of (acceptable) measurements per sample between 2 and 13 inclusive.

Where the standard deviation between measurements for a sample is greater than my long-term stdev for the Aldrich, I use the standard deviation between measurements for the sample.

Where the standard deviation between measurements for a sample is less than that for Aldrich, I can either use the Aldrich stdev or I can use the measured stdev for the specific sample. How many measurements of a specific sample do I have to make before it becomes legit to trust the measured stdev for the sample rather than my long-term average for the Aldrich standard? Any pointers on how to work this out would be greatly appreciated - my supervisor is handwaving as "maybe ten?" but I'd like to have some kind of defensible reason for doing the thing...

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kaberett: Overlaid Mars & Venus symbols, with Swiss Army knife tools at other positions around the central circle. (Default)
kaberett

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