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Data & Tools · Datasets · continued

Aggregated purity results across four services, with caveats — a second dataset posts 121–150

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.

SO
s.ostergaardTL2 Moderator10 Sep 2025#121

Limitations of datasets: all community-collected data has limitations. The population is self-selected (people in this community are not representative of all people using these compounds). Reporting bias is real (remarkable outcomes get reported; mundane outcomes do not).

0 likes 11mo
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bias_varianceTL4Biostatistician10 Sep 2025#122

How to contribute: if you have longitudinal data you want to add, the format is simple: date, measurement, context. Contact the maintainer of the specific dataset.

1 like 11mo
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d.ferreiraTL2 Moderator11 Sep 2025#123
t.dumitru, post #7: Combining data from different sources: datasets from this site are not directly comparable to published trials because the populations are different. They are worth reading separately, not merged together. Go to post

I disagree with the reply above, and I think the disagreement is substantive rather than terminological.

The distinction being drawn does not survive when you look at the published data for this specific question. I would be glad to be shown wrong on this, because the version I am arguing against is more convenient.

6 likes in reply to #7 11mo
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batchlogTL3Regular11 Sep 2025 · edited#124

Coming back to post #122, because the follow-up matters more than the original answer.

Community-collected datasets: some members have compiled datasets from their own experience and shared them. They are self-reported, unblinded, and therefore limited as evidence. But they show real patterns that people experience.

15 likes 11mo
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c.chowdhuryTL2 Moderator11 Sep 2025#125

post #124 is right about the mechanism and I think understates the practical bit.

Temporal bias: older data in a dataset might reflect conditions (supplier, formulation, context) that have changed. Newer data is more current.

0 likes 11mo
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two_year_lineTL3Regular11 Sep 2025#126
r.sobczak, post #78: Coming back to post #76, because the follow-up matters more than the original answer. Reproducibility: if sharing data, include enough context (compound, dose, timeframe, method) that someone reading it understands what it represents. Go to post

Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own records is not any individual result; it is that they are dated and consecutive.

3 likes in reply to #78 11mo
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i.balogunTL2 Moderator11 Sep 2025#127
s.rasmussen, post #120: Bias toward positive outcomes: datasets collected by members are biased toward people who found the compounds useful. People who did not respond do not return. People who had bad outcomes might have left the community. Go to post

Privacy: if contributing data, only share data you are comfortable making permanent and public. Once posted, data is persistent.

10 likes in reply to #120 11mo
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j.rasmussenTL2Regular11 Sep 2025#128

Reproducibility: if sharing data, include enough context (compound, dose, timeframe, method) that someone reading it understands what it represents.

22 likes 11mo
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y.adeyemiTL2 Moderator11 Sep 2025#129

Using data in discussions: datasets are useful as reference points when someone claims something unusual. "I have not seen that reported in the data" is different from "that is impossible", but data gives you something to say.

0 likes 11mo
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a.thorneTL2Wiki editor11 Sep 2025#130
ambient_review, post #67: How to contribute: if you have longitudinal data you want to add, the format is simple: date, measurement, context. Contact the maintainer of the specific dataset. Go to post

On post #126 — agreed on the reasoning, with one qualification.

Community-collected datasets: some members have compiled datasets from their own experience and shared them. They are self-reported, unblinded, and therefore limited as evidence. But they show real patterns that people experience.

5 likes in reply to #67 11mo
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a.lindqvistTL2 Moderator11 Sep 2025#131

How to contribute: if you have longitudinal data you want to add, the format is simple: date, measurement, context. Contact the maintainer of the specific dataset.

29 likes 11mo
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g.valckenaereTL3Regular11 Sep 2025 · edited#132

This follows post #129 rather than contradicting it.

Collection methods: ask how the data were collected. Longitudinal tracking over months is stronger than retrospective recall. Prospective measurement (done while experiencing something) is stronger than memory afterward.

14 likes 11mo
SD
st.dialloTL2 Moderator11 Sep 2025#133
a.adebayo, post #109: Combining data from different sources: datasets from this site are not directly comparable to published trials because the populations are different. They are worth reading separately, not merged together. Go to post

Worth separating two things that post #129 runs together.

Combining data from different sources: datasets from this site are not directly comparable to published trials because the populations are different. They are worth reading separately, not merged together.

5 likes in reply to #109 11mo
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HHidalgoTL2Member11 Sep 2025#134

Bias toward positive outcomes: datasets collected by members are biased toward people who found the compounds useful. People who did not respond do not return. People who had bad outcomes might have left the community.

0 likes 11mo
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c.serranoTL2 Moderator11 Sep 2025#135

Coming back to post #133, because the follow-up matters more than the original answer.

Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own records is not any individual result; it is that they are dated and consecutive.

0 likes 11mo
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t.nardoneTL3Regular11 Sep 2025#136

Picking up post #133: that is the part I would want checked first.

Limitations of datasets: all community-collected data has limitations. The population is self-selected (people in this community are not representative of all people using these compounds). Reporting bias is real (remarkable outcomes get reported; mundane outcomes do not).

20 likes 11mo
IA
i.amankwahTL2 Moderator11 Sep 2025#137
two_year_line, post #126: Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own records is not any individual result; it is that they are dated and consecutive. Go to post

Reproducibility: if sharing data, include enough context (compound, dose, timeframe, method) that someone reading it understands what it represents.

9 likes in reply to #126 11mo
JV
j.vandermolenTL3Regular11 Sep 2025#138
f.danquah, post #97: post #96 answers the question as asked. The question underneath it is different. Temporal bias: older data in a dataset might reflect conditions (supplier, formulation, context) that have changed. Newer data is more current. Go to post

Privacy: if contributing data, only share data you are comfortable making permanent and public. Once posted, data is persistent.

2 likes in reply to #97 11mo
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e.mensaTL2 Moderator11 Sep 2025 · edited#139

Combining data from different sources: datasets from this site are not directly comparable to published trials because the populations are different. They are worth reading separately, not merged together.

0 likes 11mo
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vial_deskTL3Regular11 Sep 2025#140

Bias toward positive outcomes: datasets collected by members are biased toward people who found the compounds useful. People who did not respond do not return. People who had bad outcomes might have left the community.

28 likes 11mo
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s.antonsenTL2 Moderator11 Sep 2025#141

Using data in discussions: datasets are useful as reference points when someone claims something unusual. "I have not seen that reported in the data" is different from "that is impossible", but data gives you something to say.

0 likes 11mo
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q.zhao_qaTL3Quality assurance11 Sep 2025#142

Community-collected datasets: some members have compiled datasets from their own experience and shared them. They are self-reported, unblinded, and therefore limited as evidence. But they show real patterns that people experience.

0 likes 11mo
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n.villalobosTL2 Moderator11 Sep 2025#143
vial_desk, post #140: Bias toward positive outcomes: datasets collected by members are biased toward people who found the compounds useful. People who did not respond do not return. People who had bad outcomes might have left the community. Go to post

post #142 answers the question as asked. The question underneath it is different.

Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the kind that comes from remembering a figure instead of looking it up.

8 likes in reply to #140 11mo
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forest_plotTL3Evidence synthesis11 Sep 2025#144

How to contribute: if you have longitudinal data you want to add, the format is simple: date, measurement, context. Contact the maintainer of the specific dataset.

19 likes 11mo
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z.cardosoTL211 Sep 2025#145
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electrolyte_notesTL2Regular11 Sep 2025#146

I read post #144 twice before replying, because I had assumed the opposite.

Collection methods: ask how the data were collected. Longitudinal tracking over months is stronger than retrospective recall. Prospective measurement (done while experiencing something) is stronger than memory afterward.

0 likes 11mo
RL
r.lundgrenTL2 Moderator11 Sep 2025#147
r.szabo, post #14: Combining data from different sources: datasets from this site are not directly comparable to published trials because the populations are different. They are worth reading separately, not merged together. Go to post

Limitations of datasets: all community-collected data has limitations. The population is self-selected (people in this community are not representative of all people using these compounds). Reporting bias is real (remarkable outcomes get reported; mundane outcomes do not).

5 likes in reply to #14 11mo
DM
d.moreauTL2Regular11 Sep 2025 · edited#148

Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing.

The correction was fair and I had been repeating something I had not checked carefully enough.

13 likes 11mo
VB
v.bruunTL2 Moderator11 Sep 2025#149

Picking up post #146: that is the part I would want checked first.

For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.

0 likes 11mo
KR
k.redgraveTL2Member11 Sep 2025#150

Coming back to post #148, because the follow-up matters more than the original answer.

How to contribute: if you have longitudinal data you want to add, the format is simple: date, measurement, context. Contact the maintainer of the specific dataset.

4 likes 11mo