{ "resourceType": "CodeSystem", "id": "observation-statistics", "meta": { "lastUpdated": "2020-04-09T21:10:28.568+00:00" }, "text": { "status": "generated", "div": "

This code system `http://terminology.hl7.org/CodeSystem/observation-statistics` defines the following codes:

 Code Display Definition average Average The [mean](https://en.wikipedia.org/wiki/Arithmetic_mean) of N measurements over the stated period. maximum Maximum The [maximum](https://en.wikipedia.org/wiki/Maximal_element) value of N measurements over the stated period. minimum Minimum The [minimum](https://en.wikipedia.org/wiki/Minimal_element) value of N measurements over the stated period. count Count The [number] of valid measurements over the stated period that contributed to the other statistical outputs. total-count Total Count The total [number] of valid measurements over the stated period, including observations that were ignored because they did not contain valid result values. median Median The [median](https://en.wikipedia.org/wiki/Median) of N measurements over the stated period. std-dev Standard Deviation The [standard deviation](https://en.wikipedia.org/wiki/Standard_deviation) of N measurements over the stated period. sum Sum The [sum](https://en.wikipedia.org/wiki/Summation) of N measurements over the stated period. variance Variance The [variance](https://en.wikipedia.org/wiki/Variance) of N measurements over the stated period. 20-percent 20th Percentile The 20th [Percentile](https://en.wikipedia.org/wiki/Percentile) of N measurements over the stated period. 80-percent 80th Percentile The 80th [Percentile](https://en.wikipedia.org/wiki/Percentile) of N measurements over the stated period. 4-lower Lower Quartile The lower [Quartile](https://en.wikipedia.org/wiki/Quartile) Boundary of N measurements over the stated period. 4-upper Upper Quartile The upper [Quartile](https://en.wikipedia.org/wiki/Quartile) Boundary of N measurements over the stated period. 4-dev Quartile Deviation 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. 5-1 1st Quintile 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. 5-2 2nd Quintile 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. 5-3 3rd Quintile 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. 5-4 4th Quintile 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. skew Skew 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). kurtosis Kurtosis 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). regression Regression 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.
" }, "url": "http://terminology.hl7.org/CodeSystem/observation-statistics", "identifier": [ { "system": "urn:ietf:rfc:3986", "value": "urn:oid:2.16.840.1.113883.4.642.1.1126" } ], "version": "0.1.0", "name": "StatisticsCode", "title": "StatisticsCode", "status": "draft", "experimental": false, "date": "2020-04-09T21:10:28+00:00", "publisher": "HL7 (FHIR Project)", "contact": [ { "telecom": [ { "system": "url", "value": "http://hl7.org/fhir" }, { "system": "email", "value": "fhir@lists.hl7.org" } ] } ], "description": "The statistical operation parameter -\"statistic\" codes.", "caseSensitive": true, "valueSet": "http://terminology.hl7.org/ValueSet/observation-statistics", "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." } ] }