Hi all, i am new to spss complex samples and have a question regarding subpopulation analysis. This way stata knows to use only the subpopulation data in the mean. However, the sampling design information from the entire sample is used in computing variance estimates and related quantities, including standard errors, degrees of freedom. Repeated replication methods, subpopulation analysis, and missing data options in sas v9. Subpopulation interested in a specific subgroup of your sample. In the analysis of complex sample data, jackknife repeated replication is a method to estimate the variance of a statistic that can result in substantially reduced variance when compared to traditional estimators. Thus, this paper demonstrates examples of subpopulation analysis with jackknife replicate weights using a reweighting method. The stata newsa periodic publication containing articles on using stata and tips on using the software, announcements of new releases and updates, feature highlights, and other announcements of interest to interest to stata usersis sent to all stata users and those who request information about stata from us.
I am using a survey sample and am trying to analyze a subpopulation. Checking assumptions when doing a subpopulation analysis can be even more tricky. Download our english dictionary apps available for both ios and android. This is probably better than the seemingly arbitrary result i get in t2, but id really like at least the option for my result to be adjusted up to the subpopulation size. Number of observations for subpopulation estimation. Sep 24, 2014 ppt using stata for subpopulation analysis of complex sample survey data powerpoint presentation free to download posted on september 24, 2014 by data with analytic stats share this. Offers a large variety of statistical features for operations like power analysis, cluster analysis, linear regression, choice modeling and many others.
Citeseerx document details isaac councill, lee giles, pradeep teregowda. How to prepare and analyze pair data in the national. As of stata 11, most of the diagnostic commands that you would use after regress, logistic, etc. The following syntax demonstrates, generally, how an analyst can conduct subpopulation analysis using ipums data without compromising the design structure of the data. When the observed variables are categorical, cfa is also referred to as item response theory irt analysis fox, 2010. Using stata for subpopulation analysis of complex sample. This approach would give correct point estimates but incorrect standard errors. West center for statistical consultation and research university of. Non0 values are included in the analysis, except for missing values, which are excluded from the analysis. Subpopulation analysis when using the svy commands to analyze only a portion of the sample a sub population, it is important to analyze the entire data set and to use the subpopulation option to identify those observations you want to include in the estimate. Stata, spss, and epi info also have developed special procedures or modules to analyze complex sample survey data. When you specify a subpopulation analysis, only the cases in that subpopulation are used to compute the point estimates, such as means and regression coefficients.
The household component of the medical expenditure panel survey hereafter, meps is a complex, multistage probability sample that incorporates stratification, clustering, and oversampling of some subpopulations black, hispanic, and asian in some years. Number of observations for subpopulation estimation stata. Subpopulation definition of subpopulation by the free. I aim to clarify this point in this faq, which is organized as follows. Thomas lumley april 3, 2020 estimating a mean or total in a subpopulation domain from a survey, eg the mean blood pressure in women, is not done simply by taking the subset of data in that subpopulation and pretending it is a new survey. Data analysis with stata 12 tutorial university of texas. In recent years, generalpurpose statistical software packages have incorporated new procedures that feature several useful options for designbased analysis of complexsample survey data.
The model predicted logodds for the categorical subpopulations will be. May 27, 2018 offers a large variety of statistical features for operations like power analysis, cluster analysis, linear regression, choice modeling and many others. Exports graphs to eps or tif, to png or svg and so on. A closer examination of subpopulation analysis of complexsample survey data article in stata journal 84.
Using the library haven will allow you to download any data formats. As stated in the stata survey manual, when the subpop option is used, the subpopulation is actually defined by the 0s false, which indicate those cases to be excluded from the subpopulation. Applied survey data analysis in stata 11 idre stats. Ucla further adds that using if in the subpop option does not remove cases from the analysis. Stata is a suite of applications used for data analysis, data management, and graphics. Software for analysis of yrbs data centers for disease control. Data analysis with stata 12 tutorial university of texas at. Berglund, institute for social researchuniversity of michigan, ann arbor, michigan abstract.
Propensity score analysis for complex survey data using pscore. In this article, we aim to focus in more detail on the practical issues underlying subpopulation analysis of complexsample survey data. This approach has the effect of producing estimates for the population of interest, while incorporating the full sample design information for variance estimation. So, stata does adjust the subpopulation weights, but it doesnt adjust them to the subpopulation size. Mcgovern harvard center for population and development studies geary institute and school of economics, university college dublin august 2012 abstract this document provides an introduction to the use of stata. Confirmatory factor analysis cfa is used to study the relationships between a set of observed variables and a set of continuous latent variables. For general information on analysis of complex sample survey data, refer to section e, chapter 19 of the united nations book household sample surveys in developing and. How is the number of observations computed for subpopulation estimation. This entry discusses subpopulation estimation and explains why you should use the subpop option instead of if and in for your survey data analysis. Pdf using stata to analyze data from a sample survey. Subpopulation analysis is used to compute point and variance estimates for a subset of the sampled. Dec 17, 2012 introduction to stata generating variables using the generate, replace, and label commands duration.
Charles spearman 1904 is credited with developing the common factor model. Subpopulation command national center for education. In statistics, a population is a set of similar items or events which is of interest for some question or experiment. If you are looking at cigarette smokers aged 1217, code so that. In stata, this command is subpop, while in sas the command is domain.
How to prepare and analyze pair data in the national survey on. Participants will have time for a questionandanswer session building upon the examples. Guidelines for analyzing add health data carolina population. Another option is to create a dichotomous variable where the subpopulation of. Some of the assumptions dont really apply, though, because of the extremely large sample size involved. Ppt using stata for subpopulation analysis of complex.
Introduction to structural equation modeling using stata. The data set and documentation can be downloaded from the nhanes web site. Using stata for subpopulation analysis of complex sample survey data. I have created dummy records that represent values from the missing stara and clusters when i queried my set of interest. Stata wants the subpopulation variable to be coded 01. Introduction to structural equation modeling using stata chuck huber statacorp. Svy subpopulation estimation subpopulation estimation for survey data svy direct standardization direct standardization of means, proportions, and ratios. We wish to warn you that since stata 11 files are downloaded from an external source, fdm. I see the option in the spss complex samples procedures to analyze only a subpopulation. My dataset of interest is a subpopulation of a large administrative database. A statistical population can be a group of existing objects e.
Swire is a software interface enabling us to query stata for the executing of basic operations like reading or writing data. To download the product you want for free, you should use the link provided below and proceed to the developers website, as this is the only legal source to get stata 11. Nces 2014364 will help you use subsetting commands in sas and stata to. To numerically present this, you can ask stata for the skew and kurtosis statistics, including pvalues, as we did in section 3. Remarks and examples subpopulation estimation involves computing point and variance estimates for part of the.
The analysis of subpopulations is one place where survey data and. This number may not be obvious for subpopulation estimation for survey data. Svy subpopulation estimationsubpopulation estimation for survey data. A practical introduction to stata harvard university. Use the subpop option to select a subpopulation for analysis, rather than select the study population in the stata program while preparing the data file. I am trying to get mean, median, 10th percentile and 90th percentile of a continuous varaible for my subpopulation of interets. Description subpopulation estimation focuses on part of the population. A closer examination of subpopulation analysis of complex. Subpopulation definition and meaning collins english dictionary. A part or subdivision of a population, especially one originating from some other population. A closer examination of subpopulation analysis of complexsample. The formulas for the estimates of a total and its variance for a simple sampling design with no clusters or stratification are shown in the entry for subpopulation estimation in the svy survey data reference manual and are transcribed below.
Stata applies the poststratification adjustment according to the estimation. When analyzing these subpopulations aka domains, you need to use the appropriate option. According to heeringa, west and berglung applied survey data analysis, crc press, chapters 4 and 7, yes, it matters. It seems to me that adjusting to the full subpopulation size is the correct thing to do, but maybe im missing something. Will the results for such an analysis be identical to those i would obtain by selecting out only the cases in that subpopulation and running the analysis on those cases. Though the jrr for subpopulation analysis is a standard feature in stata 10. Ibm how does using a group as a subpopulation in the spss. Version control ensures statistical programs will continue to produce the same results no matter when you wrote them. How to prepare and analyze pair data in the national survey. Subpopulation estimation from the technical point of view.
Svy survey data data analysis and statistical software. Hello, i do apologize for the attachment, but given the complexity of the question i would like to provide you all the information i have. Datasets for stata survey data reference manual, release 9 stata. Stata s facilities for survey data analysis are centered around the svy pre. Combines and reshapes datasets, manages variables and creates graphs. We conclude with important considerations for subpopulation analyses and a. Spssx discussion complex samples subpopulation question. You create a new variable where 1 in the subpopulation, and 0 not in the subpopulation. A common and frequently desired technique for analysis of survey data in practice is the restriction of estimation to a subpopulation of interest. The purpose of this seminar is to explore some issues in the analysis of survey data using stata 11.
A closer examination of subpopulation analysis of complexsample survey data. The correct way to perform a subpopulation analysis with survey data in stata is to specify the subpopulation in a svy. I have a survey sample and i am using a subpopulation of the data set for my analysis. Subpopulation definition and meaning collins english. Statas facilities for survey data analysis are centered around the svy prefix command.
If so, share your ppt presentation slides online with. As ucla explains in its stata faqs, when the subpopulation options is used, only the cases defined by the subpopulation are used in the calculation of the estimate, but all cases are used in the calculation of the standard errors. I will discuss several examples of possible subpopulation analysis approaches that analysts could take using the stata svy. Introduction to stata generating variables using the generate, replace, and label commands duration. The authors recommended the unconditional subclass analysis, because it preserves the main survey design and it provides larger standard errors. The household component of the medical expenditure panel survey hereafter, meps is a complex, multistage probability sample that incorporates stratification, clustering, and oversampling of some subpopulations. Ppt using stata for subpopulation analysis of complex sample survey data powerpoint presentation free to download posted on september 24, 2014 by. He proposed that correlations between tests of mental abilities. Before we begin, you will want to be sure that your copy of stata is uptodate. Stata has two subpopulation options that are very flexible and easy.
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