Definition for Code SystemStatisticsCode

{
  "resourceType" : "CodeSystem",
  "id" : "observation-statistics",
  "meta" : {
    "lastUpdated" : "2022-09-07T10:58:29.429+10:00",
    "profile" : ["http://hl7.org/fhir/StructureDefinition/shareablecodesystem"]
  },
  "text" : {
    "status" : "generated",
    "div" : "<div>!-- Snipped for Brevity --></div>"
  },
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "oo"
  }],
  "url" : "http://hl7.org/fhir/observation-statistics",
  "identifier" : [{
    "system" : "urn:ietf:rfc:3986",
    "value" : "urn:oid:2.16.840.1.113883.4.642.4.2100"
  }],
  "version" : "5.0.0-ballot",
  "name" : "StatisticsCode",
  "status" : "active",
  "experimental" : false,
  "caseSensitive" : true,
  "content" : "complete",
  "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."
  }]
}