Scale reliability checker

Open Scale reliability checker on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "scale-reliability-checker",
  "category": "calculators",
  "built": true,
  "requirements": "Runs locally in your browser; nothing is uploaded. Paste up to 1,000,000 characters of CSV with at most 100 columns in total (including any ID column), 2 to 100 item columns, 3 to 10,000 respondents and at most 50,000 item scores in total. Blank lines at the end are ignored. Scores are plain numbers inside the declared minimum and maximum. Downloads: a JSON report plus CSV item statistics and an inter-item correlation matrix.",
  "implementation": {
    "fields": [
      {
        "key": "itemColumns",
        "label": "Item columns (optional)",
        "value": "",
        "type": "text",
        "maxLength": 20000,
        "help": "Comma-separated exact headers. Leave blank to use every column. The CSV may have at most 100 columns in total."
      },
      {
        "key": "reverseItems",
        "label": "Reverse-coded items (optional)",
        "value": "",
        "type": "text",
        "maxLength": 20000,
        "help": "Comma-separated exact headers of negatively worded items, for example q4. Leave blank when no item is reverse-worded. Requires the scale minimum and maximum."
      },
      {
        "key": "scaleMin",
        "label": "Scale minimum",
        "value": "1",
        "type": "text",
        "maxLength": 40,
        "help": "Lowest possible score, for example 1. Every score must lie inside the range."
      },
      {
        "key": "scaleMax",
        "label": "Scale maximum",
        "value": "5",
        "type": "text",
        "maxLength": 40,
        "help": "Highest possible score, for example 5."
      },
      {
        "key": "missing",
        "label": "Blank cells",
        "value": "reject",
        "type": "select",
        "values": [
          "reject",
          "drop"
        ],
        "labels": {
          "reject": "Stop and show an error",
          "drop": "Drop incomplete respondents"
        }
      },
      {
        "key": "confidence",
        "label": "Confidence level",
        "value": "0.95",
        "type": "text",
        "maxLength": 40,
        "help": "A proportion from 0.5 to 0.9999, for example 0.95."
      }
    ],
    "registrationFamily": "statistical-analysis-reference",
    "inputMaxLength": 1000000,
    "inputErrorCode": "STATISTICAL_ANALYSIS_REFERENCE_TOO_LONG",
    "note": "Runs on your device. Paste up to 1,000,000 characters of CSV with one column per item: 2 to 100 items in at most 100 columns, up to 10,000 respondents and 50,000 scores in total.",
    "experience": {
      "automatic": false,
      "single": false,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "Item scores CSV",
      "placeholder": "q1,q2,q3\n4,5,3",
      "help": "One header row of item names, then one row per respondent with numeric scores. Up to 1,000,000 characters. Review the settings before running.",
      "helpParts": [
        "One header row of item names, then one row per respondent with numeric scores.",
        "Up to 1,000,000 characters.",
        "Review the settings before running."
      ],
      "action": null
    },
    "mode": "explicit",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

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