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Statistical concept
In statistics, missing data, or missing values, occur when no data value is stored for the variable in an observation. Missing data are a common occurrence
Missing_data
Process of replacing missing data with substituted values
statistics, imputation is the process of replacing missing data with substituted values. When substituting for a data point, it is known as "unit imputation"; when
Imputation_(statistics)
Unit of information
data Data (computer science) Data acquisition Data analysis Data bank Data cable Data center Data curation Data domain Data element Data farming Data
Data
Violence against Indigenous women and girls
years. In response to activists, the federal government funded data collection on missing and murdered women, ending in 2010. The Native Women's Association
Missing and Murdered Indigenous Women
Missing_and_Murdered_Indigenous_Women
Pokémon species caused by a glitch
warned that encountering the glitch may corrupt players' game data. IGN noted MissingNo.'s appearance in Pokémon Red and Blue was one of the most famous
MissingNo.
Self-published writer on topics such as Bigfoot and missing persons
exposure, or even deliberate disappearance. After analyzing the missing person data, Polich concluded that these cases are not "outside the frequency
David_Paulides
Study of collection and analysis of data
an analyst reports incorrect units) can also occur. The presence of missing data or censoring may result in biased estimates, and specific techniques
Statistics
Form of analysis for clinical trials
consensus on how to carry out an ITT analysis in the presence of missing outcome data. Randomized clinical trials analyzed by the intention-to-treat (ITT)
Intention-to-treat_analysis
adapt the analysis method? In the case of missing data: should one neglect or impute the missing data; which imputation technique should be used? In
Data_analysis
Person who has disappeared and whose status as alive or dead cannot be confirmed
A missing person is a person who has disappeared and whose status as alive or dead cannot be confirmed as their location and condition are unknown. A
Missing_person
Data missing or collected but not analysed
adequate data management. Without this, the data become dark, and further reasons for this are e.g. missing metadata annotation, missing data management
Dark_data
information on their ultimate fates is unknown. The global statistical data on missing persons from the late 20th and early 21st centuries is unreliable due
List of people who disappeared mysteriously (2000–present)
List_of_people_who_disappeared_mysteriously_(2000–present)
Gathering information for analysis
Data collection or data gathering is the process of gathering and measuring information on targeted variables in an established system, which then enables
Data_collection
Statistical estimation method
data and the target population. The Horvitz–Thompson estimator is frequently applied in survey analyses and can be used to account for missing data,
Horvitz–Thompson_estimator
Algorithmically generated data that have a similar distribution as sampled data
they came up with a solution for how to treat partially synthetic data with missing data. Similarly, they developed the technique of Sequential Regression
Synthetic_data
difficulties in accepting ITT analysis because of clinical trial issues like missing data or adherence to protocol. This analysis can be restricted to only the
Analysis_of_clinical_trials
Statistical technique
coarsened or aggregate data. Inverse probability weighting is also used to account for missing data when subjects with missing data cannot be included in
Inverse_probability_weighting
State of qualitative or quantitative pieces of information
removing outliers, missing data interpolation) to improve the data quality. These activities can be undertaken as part of data warehousing or as part
Data_quality
Process of ensuring computer data is both correct and useful
In computing, data validation or input validation is the process of ensuring data has undergone data cleansing to confirm it has data quality, that is
Data_validation
and missing person cases in Mexico have remained a pressing social and political issue within the country since the 2000s. Searches for missing people
Missing_persons_in_Mexico
Approach of analyzing data sets in statistics
testing, and handling missing values and making transformations of variables as needed. EDA encompasses IDA. Tukey defined data analysis in 1961 as: "Procedures
Exploratory_data_analysis
Ph.D. University of London 1974
contributions lie in the statistical analysis of data with missing values and the analysis of complex sample survey data. He held the position of Professor in the
Roderick_J._A._Little
Measure of the asymmetry of random variables
of a typical center of the data. A right-skewed distribution usually appears as a left-leaning curve. Skewness in a data series may sometimes be observed
Skewness
Distinction between nominal, ordinal, interval and ratio variables
which data can be sorted but still does not allow for a relative degree of difference between them. Examples include, on one hand, dichotomous data with
Level_of_measurement
2025 television series
repetitive, but that the series improved in later ones. According to data from Showlabs, Missing You ranked third on Netflix in the United States during the week
Missing_You_(2025_TV_series)
Apparent lack of pattern or predictability in events
allows surveys of completely random groups of people to provide realistic data that is reflective of the population. Common methods of doing this include
Randomness
Condition in which the value of a measurement or observation is only partially known
problem of censored data, in which the observed value of some variable is partially known, is related to the problem of missing data, where the observed
Censoring_(statistics)
Measure of linear correlation
a method to estimate the noise level, is given elsewhere. In case of missing data, Garren derived the maximum likelihood estimator. Some distributions
Pearson correlation coefficient
Pearson_correlation_coefficient
interested in P ( Y = 1 ) {\displaystyle \mathrm {P} (Y=1)} . There is a missing data problem, however: Y can only be observed if Z = 1 {\displaystyle Z=1}
Set_identification
Visual representation of data
audience. Data scientists, analysts and data mining specialists use data visualization to check data quality, find errors, unusual gaps, missing values,
Data and information visualization
Data_and_information_visualization
Nonparametric measure of rank correlation
monotonic relationships (whether linear or not). If there are no repeated data values, a perfect Spearman correlation of +1 or −1 occurs when each of the
Spearman's rank correlation coefficient
Spearman's_rank_correlation_coefficient
Fewer women than expected in a population
for men and women. Sen's original calculations using 1980s and 1990s data for missing women were indexed using the average sex ratio in Western Europe and
Missing_women
Manipulating raw data into a form that can be readily analysed
extraneous data and outliers, filling in missing values, conforming data to standardized formats, and masking private or sensitive information. Once the data has
Data_preparation
Data combined from several measurements
data are applied in statistics, data warehouses, and in economics. There is a distinction between aggregate data and individual data. Aggregate data refers
Aggregate_data
Child who disappeared in Arkansas, 1995
Turns in Morgan Nick Case". KFSM-TV. Retrieved February 27, 2018. "AMW Missing Data File For: Morgan Nick". America's Most Wanted. Archived from the original
Disappearance_of_Morgan_Nick
American statistician (born 1943)
designed for causal inference with observational data, and for his methods for dealing with missing data. Rubin was born in Washington, D.C. into a Jewish
Donald_Rubin
Database model
table's columns are explicitly ordered. SQL uses a Null value to indicate missing data, which has no analog in the relational model. Because a row can represent
Relational_model
Measure of variation in statistics
standard deviation of a random variable, sample, statistical population, data set or probability distribution is the square root of its variance (the variance
Standard_deviation
Statistical relationship
type of statistical relationship between two random variables or bivariate data. It usually refers to the extent to which a pair of quantities are linearly
Correlation
Class of statistical survival models
any consideration of the full hazard function. This approach to survival data is called application of the Cox proportional hazards model, sometimes abbreviated
Proportional_hazards_model
transmission errors, data corruption or errors during recording. The goal of audio inpainting is to fill in the gaps (i.e., the missing portions) in the audio
Audio_inpainting
Automotive technology
the system has to be compensated for missing data samples. Example of a solution for this problem: Missing data compensation by a predictive filter. The
Brake-by-wire
Statistical method for handling missing data
a method for handling missing data. In this method, an entire record is excluded from analysis if any single value is missing. For example, consider
Listwise_deletion
Defined levels of resiliency and redundancy for IT infrastructure
Data center tiers are defined levels of resiliency and redundancy for IT facility infrastructure. They are widely used in the data center, ISP and cloud
Data_center_tiers
Mobile data technology for GSM networks
blocks not received is included in normal data blocks. Using the PAN field, the receiver may report missing data blocks immediately, rather than waiting
EDGE_(telecommunication)
Process of using data analysis for predicting population data from sample data
Statistical inference is the process of using data analysis to infer properties of an underlying probability distribution. Inferential statistical analysis
Statistical_inference
Class of statistical models
changes. As an example, suppose a linear prediction model learns from some data (perhaps primarily drawn from large beaches) that a 10 degree temperature
Generalized_linear_model
This is a list of satellite map images with missing or unclear data. Some locations on free, publicly viewable satellite map services have such issues
List of satellite map images with missing or unclear data
List_of_satellite_map_images_with_missing_or_unclear_data
Grouping a set of objects by similarity
Cluster analysis, or clustering, is a data analysis technique aimed at partitioning a set of objects into groups such that objects within the same group
Cluster_analysis
Selection of data points in statistics
Jaiswal, A. K., and Pandey A. K. (2021), Improved Imputation Methods for Missing Data in Two-Occasion Successive Sampling, Communications in Statistics: Theory
Sampling_(statistics)
Term for disproportionate media attention
Missing white woman syndrome is a term used by some social scientists, as well as media commentators, to denote disproportionate media coverage, especially
Missing_white_woman_syndrome
Experiment methodology
quasi-experimental or other non-experimental situations—commonplace with survey data, offline data, and other, more complex phenomena. "A/B testing" is a shorthand for
A/B_testing
Open collaborative humanitarian mapping project
for mapping afterwards. Missing Maps projects emphasize building, and leaving behind, local capacity and access. Rapid data collection without significant
Missing_Maps
Method of estimating the parameters of a statistical model, given observations
some observed data. This is achieved by maximizing a likelihood function so that, under the assumed statistical model, the observed data is most probable
Maximum_likelihood_estimation
Type of statistics
aim to summarize a sample, rather than use the data to learn about the population that the sample of data is thought to represent. This generally means
Descriptive_statistics
Argentine biostatistician
causal inference on the effects of medical interventions in the face of missing data. She is Prentice Endowed Professor of Biostatistics in the University
Andrea_Rotnitzky
Middle quantile of a data set or probability distribution
the higher half from the lower half of a data sample, a population, or a probability distribution. For a data set, it may be thought of as the "middle"
Median
Iterative method for finding maximum likelihood estimates in statistical models
one of the data points. Given the statistical model which generates a set 𝐗 of observed data, a set of unobserved latent data or missing values 𝐙, and
Expectation–maximization algorithm
Expectation–maximization_algorithm
Review and adjustment of survey data
expectations Missing information from respondents that are not readily available Follow-ups are difficult to maintain in large data pools Coordination of Data Editing
Data_editing
Process of securing digital information
Data security or data protection is the process of securing digital information to protect it from online threats. Data security or protection means protecting
Data_security
Manipulation of data before it is analyzed
process. Data collection methods are often loosely controlled, resulting in out-of-range values, impossible data combinations, and missing values, amongst
Data_preprocessing
Collection of data
present their data in the classical data set fashion. If data is missing or suspicious an imputation method may be used to complete a data set. Data sets are
Data_set
Method of data analysis
technique with applications in exploratory data analysis, visualization and data preprocessing. The data are linearly transformed onto a new coordinate
Principal_component_analysis
Python library for data analysis
reindexing, label-based selection, and handling missing data. A DataFrame is a two-dimensional, tabular data structure with labeled rows and columns. Each
Pandas_(software)
Data visualization
demonstrating graphically the locality, spread and skewness groups of numerical data through their quartiles. In addition to the box on a box plot, there can
Box_plot
Statistical modeling method
predictor functions whose unknown model parameters are estimated from the data. Most commonly, the conditional mean of the response given the values of
Linear_regression
Type of file format
verification of data integrity, with the capability to perform data recovery operations that can repair or regenerate corrupted or missing data. Parchive was
Parchive
In computing, a data type whose structure is not defined in an interface
the missing information. The concrete representation of the type is hidden from its users, and the visible implementation is incomplete. A data type
Opaque_data_type
Method of statistical inference
hypothesis test is a method of statistical inference used to decide whether the data provides sufficient evidence to reject a particular hypothesis. A statistical
Statistical_hypothesis_test
Sequence of data points over time
("reading between the lines"). Interpolation is useful where the data surrounding the missing data is available and its trend, seasonality, and longer-term cycles
Time_series
Type of statistics
sensitive to model assumptions. Replacing missing data is called imputation. If there are relatively few missing points, there are some models which can
Robust_statistics
Type of average of a collection of numbers
of a data set. When the values in a data set form an arithmetic progression, the median and arithmetic mean are equal. For example, in the data set 1
Arithmetic_mean
Simultaneous observation and analysis of more than one outcome variable
experimentally acquired set of data the values of some components of a given data point are missing. Rather than discarding the whole data point, it is common to
Multivariate_statistics
Analysis of large datasets to understand living systems
larger than the number of samples (typically tens or hundreds) Noisy and missing data Privacy concerns (e.g., electronic health record confidentiality) Requirement
Biomedical_data_science
Swedish logician, philosopher, and mathematical statistician
concerning exponential families, the expectation–maximization method for missing data, and model selection. Per Martin-Löf received his PhD in 1970 from Stockholm
Per_Martin-Löf
Method of statistical inference
updating is particularly important in the dynamic analysis of a sequence of data. Bayesian inference has found application in a wide range of activities,
Bayesian_inference
Principal protocol used for transmission of datagrams across an IP network
as TCP does not provide subsequent data to the application while it is requesting a re-send of the missing data. Numerous key Internet applications use
User_Datagram_Protocol
Set of statistical processes for estimating the relationships among variables
curves, images, graphs, or other complex data objects, regression methods accommodating various types of missing data, nonparametric regression, Bayesian methods
Regression_analysis
Measure of statistical dispersion
(IQR) is a measure of statistical dispersion, which is the spread of the data. The IQR may also be called the midspread, middle 50%, fourth spread, or
Interquartile_range
Graphical representation of the distribution of numerical data
histogram is a visual representation of the distribution of quantitative data. To construct a histogram, the first step is to "bin" (or "bucket") the range
Histogram
American children's rights organization
The National Center for Missing & Exploited Children (NCMEC; /nɛk mək/) is a private, nonprofit organization established in 1984 by the United States
National Center for Missing & Exploited Children
National_Center_for_Missing_&_Exploited_Children
Function of the observed sample results
probability that the studied hypothesis is true, or the probability that the data were produced by random chance alone" and that "a p-value, or statistical
P-value
U.S. House district for New York
a 2026 congressional study. 1803–1813: [data missing] 1813–1823: Montgomery County 1823–1913: [data missing] 1913–1945: Parts of Manhattan 1945–1983:
New York's 14th congressional district
New_York's_14th_congressional_district
Any of a set of standard configurations of Redundant Arrays of Independent Disks
part of a scrub. The redundant information is used to reconstruct the missing data, rather than to identify the faulted drive. Drives are considered to
Standard_RAID_levels
Profession
A data entry clerk, also known as data preparation and control operator, data registration and control operator, and data preparation and registration
Data_entry_clerk
Type of statistical measure over subsets of a dataset
mean) is a calculation to analyze data points by creating a series of averages of different selections of the full data set. Variations include: simple
Moving_average
Algorithms for matrix decomposition
applications in such fields as astronomy, computer vision, document clustering, missing data imputation, chemometrics, audio signal processing, recommender systems
Non-negative matrix factorization
Non-negative_matrix_factorization
Relative measure of dispersion expressed as the ratio of standard deviation to the mean
the population. The coefficient of variation should be computed only for data measured on scales that have a meaningful zero (ratio scale) and hence allow
Coefficient_of_variation
Distributed architecture framework for data management
book}}: CS1 maint: location missing publisher (link) Machado, Inês Araújo; Costa, Carlos; Santos, Maribel Yasmina (2022-01-01). "Data Mesh: Concepts and Principles
Data_mesh
Data that is findable, accessible, interoperable, and reusable
FAIR data is data which meets the 2016 FAIR principles of findability, accessibility, interoperability, and reusability, first formally published in 2016
FAIR_data
List of aircraft that disappeared
This list of missing aircraft includes aircraft that have disappeared and whose locations are unknown. According to Annex 13 of the International Civil
List_of_missing_aircraft
Compilation of information about a given population
disseminating data on the structure of agriculture, covering the whole or a significant part of a country." "In a census of agriculture, data are collected
Census
Multinational non-governmental organization
Debt, AIDS, Trade, Africa (DATA) was a multinational non-governmental organization founded in January 2002 in London by U2's lead vocalist, Bono, with
DATA
Statistical measure of inter-rater agreement
coders, each assigning one value to one unit of analysis, to incomplete (missing) data, to any number of values available for coding a variable, to binary
Krippendorff's_alpha
United Kingdom missing persons charity
NMPH to research why people go missing. At the time it was the extensive study of missing persons in the UK and drew on data from nearly 2,000 adults and
Missing_People
Estimator for quality of a statistical model
relative quality of statistical models for a given set of data. Given a collection of models for the data, AIC estimates the quality of each model, relative
Akaike_information_criterion
Value that appears most often in a set of data
In statistics, the mode is the value that appears most often in a set of data values. If X is a discrete random variable, the mode is the value x at which
Mode_(statistics)
Episode of South Park
event of his death, his closest friends would know where to find his missing data by retracing their steps. Stan returns to South Park to pay his respects
South_Park:_Post_COVID
Statistical method
estimator by resampling (often with replacement) one's data or a model which is estimated from the data. Bootstrapping assigns measures of accuracy (bias,
Bootstrapping_(statistics)
sometimes have missing data. Changes in methodology can result in altercations to the data collected, for example when using these data to assess health
Administrative_data
travel, tourism, insurance
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travel, tourism, insurance