http://hl7.org/fhir/observation-statistics|5.0.0

{
  "description" : "The statistical operation parameter -\\\"statistic\\\" codes.",
  "compose" : null,
  "package" : "hl7.fhir.r5.core@5.0.0",
  "date" : "2022-11-30T22:29:23Z",
  "meta" : {
    "profile" : [ "http://hl7.org/fhir/StructureDefinition/shareablecodesystem" ],
    "lastUpdated" : "2023-03-26T15:21:02.749+11:00"
  },
  "publisher" : "HL7 (FHIR Project)",
  "jurisdiction" : [ {
    "coding" : [ {
      "code" : "001",
      "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
      "display" : "World"
    } ]
  } ],
  "content" : "complete",
  "name" : "StatisticsCode",
  "experimental" : false,
  "resourceType" : "CodeSystem",
  "title" : "Statistics Code",
  "supliment" : null,
  "extension" : [ {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "oo"
  } ],
  "status" : "active",
  "id" : "23ab4636-6531-57a2-9b71-0ec21b4570c8",
  "valueSet" : "http://hl7.org/fhir/ValueSet/observation-statistics",
  "url" : "http://hl7.org/fhir/observation-statistics",
  "identifier" : [ {
    "value" : "urn:oid:2.16.840.1.113883.4.642.1.1126",
    "system" : "urn:ietf:rfc:3986"
  }, {
    "use" : "old",
    "value" : "urn:oid:2.16.840.1.113883.4.642.1.395",
    "system" : "urn:ietf:rfc:3986"
  } ],
  "concept" : [ {
    "code" : "average",
    "display" : "Average",
    "definition" : "The [mean](https://en.wikipedia.org/wiki/Arithmetic_mean) of N measurements over the stated period."
  }, {
    "code" : "maximum",
    "display" : "Maximum",
    "definition" : "The [maximum](https://en.wikipedia.org/wiki/Maximal_element) value of N measurements over the stated period."
  }, {
    "code" : "minimum",
    "display" : "Minimum",
    "definition" : "The [minimum](https://en.wikipedia.org/wiki/Minimal_element) value of N measurements over the stated period."
  }, {
    "code" : "count",
    "display" : "Count",
    "definition" : "The [number] of valid measurements over the stated period that contributed to the other statistical outputs."
  }, {
    "code" : "total-count",
    "display" : "Total Count",
    "definition" : "The total [number] of valid measurements over the stated period, including observations that were ignored because they did not contain valid result values."
  }, {
    "code" : "median",
    "display" : "Median",
    "definition" : "The [median](https://en.wikipedia.org/wiki/Median) of N measurements over the stated period."
  }, {
    "code" : "std-dev",
    "display" : "Standard Deviation",
    "definition" : "The [standard deviation](https://en.wikipedia.org/wiki/Standard_deviation) of N measurements over the stated period."
  }, {
    "code" : "sum",
    "display" : "Sum",
    "definition" : "The [sum](https://en.wikipedia.org/wiki/Summation) of N measurements over the stated period."
  }, {
    "code" : "variance",
    "display" : "Variance",
    "definition" : "The [variance](https://en.wikipedia.org/wiki/Variance) of N measurements over the stated period."
  }, {
    "code" : "20-percent",
    "display" : "20th Percentile",
    "definition" : "The 20th [Percentile](https://en.wikipedia.org/wiki/Percentile) of N measurements over the stated period."
  }, {
    "code" : "80-percent",
    "display" : "80th Percentile",
    "definition" : "The 80th [Percentile](https://en.wikipedia.org/wiki/Percentile) of N measurements over the stated period."
  }, {
    "code" : "4-lower",
    "display" : "Lower Quartile",
    "definition" : "The lower [Quartile](https://en.wikipedia.org/wiki/Quartile) Boundary of N measurements over the stated period."
  }, {
    "code" : "4-upper",
    "display" : "Upper Quartile",
    "definition" : "The upper [Quartile](https://en.wikipedia.org/wiki/Quartile) Boundary of N measurements over the stated period."
  }, {
    "code" : "4-dev",
    "display" : "Quartile Deviation",
    "definition" : "The difference between the upper and lower [Quartiles](https://en.wikipedia.org/wiki/Quartile) is called the Interquartile range. (IQR = Q3-Q1) Quartile deviation or Semi-interquartile range is one-half the difference between the first and the third quartiles."
  }, {
    "code" : "5-1",
    "display" : "1st Quintile",
    "definition" : "The lowest of four values that divide the N measurements into a frequency distribution of five classes with each containing one fifth of the total population."
  }, {
    "code" : "5-2",
    "display" : "2nd Quintile",
    "definition" : "The second of four values that divide the N measurements into a frequency distribution of five classes with each containing one fifth of the total population."
  }, {
    "code" : "5-3",
    "display" : "3rd Quintile",
    "definition" : "The third of four values that divide the N measurements into a frequency distribution of five classes with each containing one fifth of the total population."
  }, {
    "code" : "5-4",
    "display" : "4th Quintile",
    "definition" : "The fourth of four values that divide the N measurements into a frequency distribution of five classes with each containing one fifth of the total population."
  }, {
    "code" : "skew",
    "display" : "Skew",
    "definition" : "Skewness is a measure of the asymmetry of the probability distribution of a real-valued random variable about its mean. The skewness value can be positive or negative, or even undefined.  Source: [Wikipedia](https://en.wikipedia.org/wiki/Skewness)."
  }, {
    "code" : "kurtosis",
    "display" : "Kurtosis",
    "definition" : "Kurtosis  is a measure of the \"tailedness\" of the probability distribution of a real-valued random variable.   Source: [Wikipedia](https://en.wikipedia.org/wiki/Kurtosis)."
  }, {
    "code" : "regression",
    "display" : "Regression",
    "definition" : "Linear regression is an approach for modeling two-dimensional sample points with one independent variable and one dependent variable (conventionally, the x and y coordinates in a Cartesian coordinate system) and finds a linear function (a non-vertical straight line) that, as accurately as possible, predicts the dependent variable values as a function of the independent variables. Source: [Wikipedia](https://en.wikipedia.org/wiki/Simple_linear_regression)  This Statistic code will return both a gradient and an intercept value."
  } ],
  "caseSensitive" : true,
  "version" : "5.0.0",
  "contact" : [ {
    "telecom" : [ {
      "value" : "http://hl7.org/fhir",
      "system" : "url"
    }, {
      "value" : "fhir@lists.hl7.org",
      "system" : "email"
    } ]
  } ]
}