{"uid":"cap_c8LTcR49xNgx0oV4Cwoos","slug":"sampling-observations-two-measure-correlation-secondary-measure-cfefc75f","name":"Sampling Observations: Two-Measure Correlation + Secondary-Measure Weighted Mean","description":"Sampling observations — Two-measure correlation + Secondary-measure weighted mean: Two-measure correlation + Secondary-measure weighted mean for supplied sampling observations records (sample_value, sample_weight). Up to 200 rows; 2 independent reports using shared local analytical engines. No live lookup, prediction, professional assessment or external action. 0.01 USDC includes 2 supplied-data reports for up to 200 rows.","url":"https://market.datapackvibe.com/x402/assistant-ib26-analytics-15-181?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"rows":{"type":"array","items":{"type":"object","required":["row_id","dataset_group","date","sample_value","sample_weight"],"properties":{"date":{"type":"string","default":"","pattern":"^\\d{4}-\\d{2}-\\d{2}$","maxLength":10},"row_id":{"type":"string","default":"","maxLength":80,"minLength":1},"sample_value":{"type":["number","null"],"maximum":1000000000000,"minimum":-1000000000000},"dataset_group":{"type":"string","default":"","maxLength":80},"sample_weight":{"type":["number","null"],"maximum":1000000000000,"minimum":-1000000000000}},"additionalProperties":false},"default":[{"date":"2026-10-01","row_id":"row-1","sample_value":10,"dataset_group":"group-a","sample_weight":1},{"date":"2026-10-02","row_id":"row-2","sample_value":20,"dataset_group":"group-b","sample_weight":2},{"date":"2026-10-03","row_id":"row-3","sample_value":15,"dataset_group":"group-a","sample_weight":3},{"date":"2026-10-04","row_id":"row-4","sample_value":30,"dataset_group":"group-b","sample_weight":4}],"maxItems":200,"minItems":1},"field":{"enum":["sample_value","sample_weight"],"type":"string","default":"sample_value"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_GEoZW7sEGVKBSYh-G4Gi4","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes Pearson correlation between two measures and the weighted mean of a secondary measure for up to 200 supplied sampling observation rows.","exampleAgentPrompt":"Can you run a two-measure correlation and weighted mean analysis on my sampling data? I have 4 rows: row-1 on 2026-10-01 in group-a with sample_value 10 and weight 1; row-2 on 2026-10-02 in group-b with value 20 and weight 2; row-3 on 2026-10-03 in group-a with value 15 and weight 3; row-4 on 2026-10-04 in group-b with value 30 and weight 4 — use sample_value as the primary field.","exampleUseCases":[{"title":"Environmental sampling correlation study","prompt":"I have 50 soil sample observations each with a measured contaminant level (sample_value) and a collection volume weight (sample_weight) from various sites — can you compute the correlation between those two measures and the weighted mean of the contaminant levels for me?"},{"title":"Survey response weighted analysis","prompt":"I've got 120 survey rows where sample_value is the respondent score and sample_weight reflects how representative each respondent is — please calculate the correlation between scores and weights, plus the weighted mean score across all respondents."},{"title":"QC batch measurement review","prompt":"Can you analyze my quality control batch data? I have up to 150 rows from groups A and B with measured values and sampling weights — I need the two-measure correlation and the weighted mean of the primary measurements to assess consistency."}],"resultDescription":"Returns two statistical reports: (1) the Pearson correlation coefficient between sample_value and sample_weight across the supplied rows, and (2) the weighted mean of the secondary measure (sample_weight) using the supplied weights, both computed locally without any external lookup or prediction.","failureModes":["Fewer than 1 row supplied — minItems violation","More than 200 rows supplied — maxItems violation","Missing required fields (row_id, dataset_group, date, sample_value, sample_weight) in any row","Date field not matching YYYY-MM-DD pattern","All sample_value or sample_weight entries are null — correlation undefined","Insufficient variance in data — correlation computation returns NaN or undefined result","Payment not completed — x402 payment required before response"],"whenToPreferThis":"Choose this endpoint when you need both a two-measure correlation and a weighted mean computed together in a single call on up to 200 rows of your own supplied data. It requires no external data sources, does no live lookup or prediction, and is well-suited for offline statistical summaries of sampling, survey, or measurement datasets where you already have the values and weights.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-24T00:54:07.978Z","isFirstParty":false,"canonicalSlug":"sampling-observations-two-measure-correlation-secondary-measure-cfefc75f"}