Property talk:P4844

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research intervention
the focus of an experiment, also called the experimental variable, research activity, or study intervention

Represents	research intervention (Q26256310)
Data type	Item
Domain	clinical trial (Q30612), experiment (Q101965), protein (Q8054) or cell line (Q21014462)
Example	PARAMOUNT trial (Q17148583) → pemetrexed (Q415220) A Randomized Phase III Study of Weekly ABI-007 Plus Gemcitabine Versus Gemcitabine Alone in Patients With Metastatic Adenocarcinoma of the Pancreas (Q47477264) → gemcitabine (Q414143) Galileo's Leaning Tower of Pisa experiment (Q5518616) → fall (Q11620540) Stanford prison experiment (Q235089) → incarceration (Q853735) Tearoom Trade: Impersonal Sex in Public Places (Q7691787) → outing (Q1054678)
See also	study type (P8363)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties By value of property Most statements Fewest statements Most sitelinks Most linked wikis Total of sitelinks on items Most identifiers Fewest identifiers Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Constraint violations/P4844 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 204,285 Main statement 204,279 >99.9% of uses Qualifier 5 <0.1% of uses Reference 1 <0.1% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Type “clinical trial (Q30612), experiment (Q101965), protein (Q8054), cell line (Q21014462)”: item must contain property “instance of (P31)” with classes “clinical trial (Q30612), experiment (Q101965), protein (Q8054), cell line (Q21014462)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P4844#Type Q30612, Q101965, Q8054, Q21014462, SPARQL

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

List of violations of this constraint: Database reports/Constraint violations/P4844#Scope, hourly updated report, SPARQL

Clinical trials is too narrow a constraint for this property

I think clinical trials is too narrow a constraint for this property. I would like to use Research intervention for agricultural experiments and apart from the constraint this would be a suitable property.  – The preceding unsigned comment was added by Richardostler (talk • contribs) at 09:08, 23 April 2018‎ (UTC).

@Richardostler: I am not expecting that clinical trials are a restraint. This should be available for any item which is an instance of an experiment. What barrier do you see? Blue Rasberry (talk) 20:21, 24 April 2018 (UTC)

@Bluerasberry: I agree this should be available for any instance/subclass of an experiment. I've used this property for several long-term agricultural experiments (sub class of experiment) e.g. Broadbalk long-term experiment (Q41331872), but it shows the issue warning: "Entities using the research intervention property should be instances of clinical trial (or of a subclass of it)". Clearly clinical trial isn't appropriate for my use case. I have in fact added experiment as a type constraint for the "Research intervention" property, but it doesn't seem to be recognised. Should add I'm fairly new to this so it could well be an error on my part! Richardostler (talk) 12:34, 25 April 2018 (UTC)

@Richardostler: Everyone is new to Wikidata, so everyone is a little confused.

Can you tell me how to see this error message? The usage guidelines say that this property is for "clinical trials" and "experiments". In the item you shared, it is an long-term experiment (Q6672146) and a agricultural experiment (Q52146473), which are both subclasses of experiments and should not give error messages. I just added "clinical trial" to be a subclass of experiment also. I am not sure how to configure properties but if you are getting an error message I would like to learn why and what to do about it. Blue Rasberry (talk) 14:58, 25 April 2018 (UTC)

@Bluerasberry: If you got to Broadbalk long-term experiment (Q41331872) and scroll down to the research interventions, when I'm logged in, for each of the statement items (e.g. nitrogen fertilizer), I see an exclamation mark icon. Clicking on that I see the warning mentioned in my previous reply. If I'm logged out I don't see this warning.--Richardostler (talk) 17:24, 25 April 2018 (UTC)

@Richardostler: Okay, now I see the problem and the exclamation points. There is a problem log at Wikidata:Database reports/Constraint violations/P4844. There is general documentation at Help:Property constraints portal.

I do not know how to fix this, but I gave a go at editing Property:P4844#P2302 to add that it can be a subclass of an experiment, which I thought could have fixed this situation. I think this is incorrect, because I think that whenever someone adds an instance of a constraint, then it also applies to the subclass.

Perhaps you look at the documentation and situation also, then let's go to the talk page of that "property constraints portal" and ask for advice. If you would like to take the lead and request help there then I would follow you. Thanks. Blue Rasberry (talk) 18:20, 25 April 2018 (UTC)

@Bluerasberry: Ok I'll have a look at the documentation and go from there. Thanks for your help.--Richardostler (talk) 20:30, 25 April 2018 (UTC)

@Bluerasberry: This should be ok now. Instead of creating a new type constraint value for each class you want to allow, the solution is to add all allowed classes to the same type constraint value. See the updated property - Property:P4844#P2302. Strictly, clinical trials is probably redundant since it is a subclass of experiment.--Richardostler (talk) 16:44, 26 April 2018 (UTC)

Observatories

I used this property to state what a program of environmental monitoring : Copernicus Programme (Q1531636)   , to state that for example one of the goal of the program was to monitore variables to forecast air quality. The constraint does not match right now, either we need a better way (please say if you know one currently), or to broader the constraint (I want to discuss this first). author  TomT0m / talk page 10:34, 12 March 2024 (UTC)