This page is part of the HL7 Terminology (v1.0.0: Release) based on FHIR R4. The current version which supercedes this version is 2.1.0. For a full list of available versions, see the Directory of published versions

**Summary**

Defining URL: | http://terminology.hl7.org/ValueSet/attribute-estimate-type |

Version: | 4.1.0 |

Name: | StatisticAttributeEstimateType |

Status: | draft |

Title: | StatisticAttributeEstimateType |

Definition: | Method of reporting variability of estimates, such as confidence intervals, interquartile range or standard deviation. |

Publisher: | HL7 (FHIR Project) |

Committee: | FHIR Infrastructure |

OID: | 2.16.840.1.113883.4.642.3.1412 (for OID based terminology systems) |

Maturity: | 5 |

Source Resource: | XML / JSON / Turtle |

**References**

This value set is not used

- Include all codes defined in
`http://terminology.hl7.org/CodeSystem/attribute-estimate-type`

This value set contains 11 concepts

Expansion based on StatisticAttribute Estimate Type v4.2.0 (CodeSystem)

All codes from system `http://terminology.hl7.org/CodeSystem/attribute-estimate-type`

Code | Display | Definition |

0000419 | Cochran's Q statistic | A measure of heterogeneity accros study computed by summing the squared deviations of each study's estimate from the overall meta-analytic estimate, weighting each study's contribution in the same manner as in the meta-analysis. |

C53324 | Confidence interval | A range of values considered compatible with the observed data at the specified confidence level. |

0000455 | Credible interval | An interval of a posterior distribution which is such that the density at any point inside the interval is greater than the density at any point outside and that the area under the curve for that interval is equal to a prespecified probability level. For any probability level there is generally only one such interval, which is also often known as the highest posterior density region. Unlike the usual confidence interval associated with frequentist inference, here the intervals specify the range within which parameters lie with a certain probability. The bayesian counterparts of the confidence interval used in frequentists statistics. |

0000420 | I-squared | The percentage of total variation across studies that is due to heterogeneity rather than chance. I2 can be readily calculated from basic results obtained from a typical meta-analysis as i2 = 100%×(q - df)/q, where q is cochran's heterogeneity statistic and df the degrees of freedom. Negative values of i2 are put equal to zero so that i2 lies between 0% and 100%. A value of 0% indicates no observed heterogeneity, and larger values show increasing heterogeneity. Unlike cochran's q, it does not inherently depend upon the number of studies considered. A confidence interval for i² is constructed using either i) the iterative non-central chi-squared distribution method of hedges and piggott (2001); or ii) the test-based method of higgins and thompson (2002). The non-central chi-square method is currently the method of choice (higgins, personal communication, 2006) – it is computed if the 'exact' option is selected. |

C53245 | Interquartile range | The difference between the 3d and 1st quartiles is called the interquartile range and it is used as a measure of variability (dispersion). |

C44185 | P-value | The probability of obtaining the results obtained, or more extreme results, if the hypothesis being tested and all other model assumptions are true. |

C38013 | Range | The difference between the lowest and highest numerical values; the limits or scale of variation. |

C53322 | Standard deviation | A measure of the range of values in a set of numbers. Standard deviation is a statistic used as a measure of the dispersion or variation in a distribution, equal to the square root of the arithmetic mean of the squares of the deviations from the arithmetic mean. |

0000037 | Standard error of the mean | The standard deviation of the sample-mean's estimate of a population mean. It is calculated by dividing the sample standard deviation (i.e., the sample-based estimate of the standard deviation of the population) by the square root of n , the size (number of observations) of the sample. |

0000421 | Tau squared | An estimate of the between-study variance in a random-effects meta-analysis. The square root of this number (i.e. Tau) is the estimated standard deviation of underlying effects across studies. |

C48918 | Variance | A measure of the variability in a sample or population. It is calculated as the mean squared deviation (MSD) of the individual values from their common mean. In calculating the MSD, the divisor n is commonly used for a population variance and the divisor n-1 for a sample variance. |

Explanation of the columns that may appear on this page:

Level | A few code lists that FHIR defines are hierarchical - each code is assigned a level. In this scheme, some codes are under other codes, and imply that the code they are under also applies |

Source | The source of the definition of the code (when the value set draws in codes defined elsewhere) |

Code | The code (used as the code in the resource instance) |

Display | The display (used in the display element of a Coding). If there is no display, implementers should not simply display the code, but map the concept into their application |

Definition | An explanation of the meaning of the concept |

Comments | Additional notes about how to use the code |

**History**

Date | Action | Author | Custodian | Comment |

2020-05-06 | revise | Ted Klein | Vocabulary WG | Migrated to the UTG maintenance environment and publishing tooling. |