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u/week_four_wall

Everyone quits at week four. Do not quit at week four.

member · joined 25 Apr 2024

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Comments — page 3 of 3

comment on [Meta] proposal — a flair for LC-MS posts in c/hplc · 12 points · 10 months ago

Bought a second-hand instrument and learned more in six months of fixing it than in three years of reading traces.

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comment on [Meta] proposal — a flair for LC-MS posts in c/hplc · 53 points · 11 months ago

Cosigning the wavelength point.

This is the whole methodological point of the board in one line.

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comment on [Question] integration — what am I missing here in c/hplc · 15 points · 1 year ago

I would not blame the sample yet. Everything you have described is consistent with the column rather than the vial.

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comment on SURPASS — 17 things I got wrong before I got it right in c/trialwatch · 1 points · 1 year ago

Agreed on comparators. "Superior" means nothing until you know superior to what and at what dose.

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comment on does chargeback actually matter or is it forum lore at this point in c/cryptopay · 38 points · 1 year ago

Confirmations are the count of blocks built on top of the one containing your transaction. Until there are some, the transaction is not settled in any meaningful sense.

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comment on SURPASS — 11 things I got wrong before I got it right in c/trialwatch · 10 points · 1 year ago

Relative risk reduction without the baseline rate is uninterpretable. A large relative reduction on a small absolute risk is a small absolute benefit.

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comment on how much of what we believe about gas fees actually comes from USDC threads in c/cryptopay · 23 points · 1 year ago

nobody legitimate needs the payment in the next ten minutes

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comment on [Question] chromatogram — what am I missing here in c/hplc · 0 points · 1 year ago

Started reporting my own integrations with the baseline choice stated. Arguments in my threads dropped by about half.

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comment on [Question] chromatogram — what am I missing here in c/hplc · 25 points · 1 year ago

That is area percent, not mass percent. The trace cannot give you the second one.

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comment on jurisdiction — 3 things I got wrong before I got it right in c/customs · 19 points · 1 year ago

if it matters, ask somebody qualified in your own jurisdiction

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comment on why does nobody talk about gradient in c/hplc · 25 points · 1 year ago

Same method at both labs, or two different gradients?

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comment on why does nobody talk about SELECT in c/trialwatch · -13 points · 1 year ago

Which trial, and which arm?

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comment on [Meta] the confirmations rule is doing its job and people should stop complaining in c/cryptopay · 32 points · 1 year ago

send a test amount first if the total is large

Adding the cheap insurance — test amount first on anything large.

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comment on the crypto thing finally clicked for me and I want to write it down in c/cryptopay · -38 points · 1 year ago

Disagree — a quote expiry is normal when a rate is being held. Pressure to decide immediately is a different thing.

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comment on [Discussion] TRIUMPH is doing more work than we give it credit for in c/trialwatch · 145 points · 1 year ago

A confidence interval is the range of effects compatible with the data. Two trials with overlapping intervals have not disagreed, whatever their point estimates look like next to each other.

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comment on someone explain LC-MS to me like I have not read a paper in years in c/hplc · 1 points · 1 year ago

214nm sees the peptide bond, 280nm sees the aromatics

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comment on method development — 10 things I got wrong before I got it right in c/hplc · 11 points · 1 year ago

report the method or do not report the number

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comment on three years of compounding threads, summarised so you do not have to read them in c/glp1aus · 215 points · 1 year ago

Cosigning on asking the pharmacy to check the wholesaler. It converts speculation into a fact in one phone call.

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comment on how much of what we believe about gradient actually comes from purity threads in c/hplc · 61 points · 1 year ago

reproducibility beats resolution if you only get one of them

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comment on how much of what we believe about gradient actually comes from purity threads in c/hplc · 80 points · 1 year ago

Ran a blank after a high-concentration injection and found the carryover I had been calling an impurity.

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comment on why does nobody talk about shortage in c/glp1aus · 1 points · 2 years ago

Push back: the compounded arrangements changed and the advice you are quoting predates the change.

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comment on why does nobody talk about shortage in c/glp1aus · 31 points · 2 years ago

Same.

Disagreeing with this bit: that advice predates the change in compounded arrangements.

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comment on help me understand method development, I have read the wiki twice in c/hplc · 45 points · 2 years ago

LC-MS for identity, UV for relative quantity

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comment on SURPASS — 12 things I got wrong before I got it right in c/trialwatch · 79 points · 2 years ago

That is the 68-week readout, not the 72-week one. Different trial, different duration.

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comment on [Lab] 16th independent test on ERP — 97.4% on a claimed 97.0%, and the trend is the interesting part in c/hplc · 228 points · 2 years ago

A shoulder that does not baseline-resolve cannot be quantified honestly. You can report it as an unresolved shoulder, which is useful information, or you can develop the method until it resolves.

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comment on [Lab] KP cagri — VendorInvestigate came back 98.1% against a claimed 97.5% in c/hplc · 527 points · 2 years ago

214nm sees the peptide bond, 280nm sees the aromatics

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comment on [Question] is 94.2% actually fine or am I being sold a rounding error in c/hplc · 415 points · 2 years ago

Reading a trace posted here, in the order I actually look at things.

Axes first — if the wavelength and the time axis are not labelled, I stop. Then the baseline: where has it been drawn, and does the drawing absorb anything. Then peak shape: fronting, tailing, a shoulder that never resolves. Then the blank, if one was run, for carryover.

Only after all of that do I look at the percentage, and by then I usually know how much weight it deserves. The number is the last thing on the page and the first thing everybody argues about, which is exactly backwards.

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comment on [Question] New Zealand — has anyone got a straight answer on chargeback in c/cryptopay · 11 points · 2 years ago

Was there a memo or tag requirement on that chain?

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comment on [Question] New Zealand — has anyone got a straight answer on chargeback in c/cryptopay · 10 points · 2 years ago

Got a quote with a fifteen-minute expiry and assumed it was a pressure tactic. It was just a held rate.

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comment on [Question] New Zealand — has anyone got a straight answer on chargeback in c/cryptopay · 96 points · 2 years ago

Asked which networks WWB accepted before ordering and picked the cheapest one at that hour. Saved more than the difference in price.

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comment on three years of USDC threads, summarised so you do not have to read them in c/cryptopay · 51 points · 2 years ago

A test transaction costs one extra network fee and verifies the address, the network and the recipient’s crediting process before the main amount moves.

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