Blar i Statistics Norway's Open Research Repository (SNORRe) på forfatter "Zhang, LiChun"

A method of weighting adjustment for survey data subject to nonignorable nonresponse
Zhang, LiChun (Discussion Papers;No. 311, Working paper, 2001)Abstract: Weighting adjustment is a standard quasirandomization approach for survey data subject to nonresponse (Little, 1986). The existing methods are typically based on the assumption that nonresponse is independent ... 
A Note on Poststratification when Analyzing Binary Survey Data Subject to Nonresponse
Zhang, LiChun (Discussion papers;218, Working paper, 199804)In this paper we follow up two notes of Thomsen (1973, 1978) and present some results on the estimation effect of poststratification when analyzing binary survey data subject to nonresponse. Using an alternative ... 
A prediction approach to sampling design
Zhang, LiChun; Thomsen, Ib (Discussion Papers;No. 440, Working paper, 2005)Abstract: Standard approaches to sample surveys take as the point of departure the estimation of one or several population totals (or means), or a few predefined subtotals (or submeans). While the modelbased prediction ... 
A calibrated imputation method for secondary data analysis of survey data
Da Silva, Damiao N; Zhang, LiChun (Peer reviewed; Journal article, 20191121)In practical survey sampling, missing data are unavoidable due to nonresponse, rejected observations by editing, disclosure control, or outlier suppression. We propose a calibrated imputation approach so that valid point ... 
Coping with decreasing response rates in Statistics Norway : recommended practice for reducing the effect of nonresponse
Thomsen, Ib; Kleven, Øyvin; Wang, Jan Henrik; Zhang, LiChun (Reports;2006/29, Report, 2006)Over the last two decades, cooperation rates in most sample surveys appear to have declined in many countries, including Norway. As a consequence, the cost of conducting surveys has increased because repeated attempts ... 
Cox regression with linked data
Vo, Thanh Huan; Garès, Valérie; Zhang, LiChun; Happe, André; Oger, Emmanuel; Paquelet, Stéphane; Chauvet, Guillaume (Peer reviewed; Journal article, 2023) 
The Effects of Using Administrative Registers in Economic Short Term Statistics: The Norwegian Labour Force Survey as a Case Study
Thomsen, Ib; Zhang, LiChun (Journal article; Peer reviewed, 2001)ABSTRACT: In the case of a single survey at one point in time, it is well known that combining administrative registers with survey data often substantially improves the quality of estimation. However, in short term ... 
Estimates for small area compositions subjected to informative missing data
Zhang, LiChun (Journal article; Peer reviewed, 2009)Abstract Estimation of small area (or domain) compositions may suffer from informative missing data, if the probability of missing varies across the categories of interest as well as the small areas. We develop a double ... 
Evaluating multilateral price indices in a dynamic item universe
Zhang, LiChun; Johansen, Ingvild; Nygaard, Ragnhild (Discussion papers;914, Working paper, 201909)Statistics Norway has a long history of using scanner data in the Consumer Price Index (CPI). The early research – in Norway as well as internationally – was focused on supermarket data which consists largely of stable ... 
Finite population small area interval estimation
Zhang, LiChun (Journal article; Peer reviewed, 2007)Small area intervall estimation is considered for a finite population, where the small area parameters are treated as fixed constants. Design based direct estimation yealds intervals that are too long to be useful. Model ... 
Graph sampling by lagged random walk
Zhang, LiChun (Peer reviewed; Journal article, 20211210)We propose a family of lagged random walk sampling methods in simple undirected graphs, where transition to the next state (i.e., node) depends on both the current and previous states—hence, lagged. The existing random ... 
Markov Chain generated profile likelihood inference under generalized proportional to size nonignorable nonresponse
Thomsen, Ib; Zhang, LiChun; Sexton, Joseph (Discussion Papers;No. 274, Working paper, 2000)We apply two nonignorable nonresponse models to the data of the Norwegian Labour Force Survey, the Fertility Survey and the Alveolar Bone Loss Survey. Both models focus on the marginal effect which the object variable ... 
Maximum entropy classification for record linkage
Lee, Danhyang; Zhang, LiChun; Kim, Jae Kwang (Peer reviewed; Journal article, 2022)By record linkage one joins records residing in separate files which are believed to be related to the same entity. In this paper we approach record linkage as a classification problem, and adapt the maximum entropy ... 
A Modelbased Approach to Variance Estimation for Fixed Weights and Chained Price Indices
Zhang, LiChun (Chapter, 2010)There is presented a modelbased approach to variance estimation for both shortterm fixed weights and longterm chained price indices. The individual price observations are treated as random variables whose probability ... 
Modeling and estimation methods for household size in the presence of nonignorable nonresponse applied to the Norwegian consumer expenditure survey
Belsby, Liv; Bjørnstad, Jan F.; Zhang, LiChun (Journal article; Peer reviewed, 2005)This paper considers the problem of estimating, in the presence of considerable nonignorable nonresponse, the number of private households of various sizes and the total number of households in Norway. The approach is ... 
A note on poststratification when analyzing binary survey data subject to nonresponse
Zhang, LiChun (Journal article; Peer reviewed, 1999)In this article we presents some results regarding the effect of poststratification when analyzing binary survey data to nonresponse. Assuming that nonresponse depends on the variable of interest which is missing for ... 
A note on the effect of auxiliary information on the variance of cluster sampling
Hagesæther, Nina; Zhang, LiChun (Journal article; Peer reviewed, 2009)A modelbased synthesis is presented for a number of wellknown results concerning the design effect of cluster sampling. This helps to yield a simpler perspective, making the designbased expressions more transparent. ... 
On dispersion preserving estimation of the mean of a binary variable from small areas
Zhang, LiChun (Discussion Papers;No. 285, Working paper, 2000)Abstract: Overshrinkage is a common problem in small area (or domain) estimation. It happens when the estimated smallarea parameters have less betweenarea variation than their true values. To deal with this problem, ... 
On some common practices of systematic sampling
Zhang, LiChun (Discussion Papers;No. 456, Working paper, 2006)Abstract: Systematic sampling is a widely used technique in survey sampling. It is easy to execute, whether the units are to be selected with equal probability or with probabilities proportional to auxiliary sizes. It ... 
On some common practices of systematic sampling
Zhang, LiChun (Journal article; Peer reviewed, 2008)Systematic sampling is widely used technique in survey sampling. It is easy to execute, whether the units are to be selected with equal probability or with probabilities proportional to auxiliary sizes. It can be very ...