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	Provedor de dados 31 (3) Autor Cox, Nicholas J. (3) Longton, Gary M. (1) Palavra-chave By (3) Research Methods/ Statistical Methods (3) Egen (2) Append (1) Collapse (1) Contract (1) Data management (1) Distinct (1) Distinctness (1) Do-files (1) For (1) Foreach (1) Forvalues (1) Log files (1) Merge (1) Naming conventions (1) Programs (1) Repetition (1) Reshape (1) Sorting (1) Mais... Tipo do documento Journal Article (2) Article (1) Ano 2008 (1) 2002 (1) 2001 (1) País United States (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Speaking Stata: Distinct observations 31 Cox, Nicholas J.; Longton, Gary M.. Distinct observations are those different with respect to one or more variables, considered either individually or jointly. Distinctness is thus a key aspect of the similarity or difference of observations. It is sometimes confounded with uniqueness. Counting the number of distinct observations may be required at any point from initial data cleaning or checking to subsequent statistical analysis. We review how far existing commands in official Stata offer solutions to this issue, and we show how to answer questions about distinct observations from first principles by using the by prefix and the egen command. The new distinct command is offered as a convenience tool. Tipo: Article Palavras-chave: Distinct; By; Egen; Distinctness; Uniqueness; Data management; Research Methods/ Statistical Methods. Ano: 2008 URL: http://purl.umn.edu/122622 Speaking Stata: How to move step by: step 31 Cox, Nicholas J.. The by varlist: construct is reviewed, showing how it can be used to tackle a variety of problems with group structure. These range from simply doing some calculations for each of several groups of observations to doing more advanced manipulations making use of the fact that with this construct, subscripts and the built-ins _n and _N are all interpreted within groups. A fairly complete tutorial on numerical evaluation of true and false conditions is included. Tipo: Journal Article Palavras-chave: By; Sorting; Subscripts; True and false; _n; _N; Research Methods/ Statistical Methods. Ano: 2002 URL: http://purl.umn.edu/115953 Speaking Stata: How to repeat yourself without going mad 31 Cox, Nicholas J.. This column will focus on how to improve your fluency in Stata. Over the next issues we will look at Stata problems of intermediate size which turn out to be soluble with a few command lines. As an introduction, systematic ways of repeating the same or similar operations are surveyed to give one overview of the territory to be covered. Tipo: Journal Article Palavras-chave: Append; By; Collapse; Contract; Do-files; Egen; For; Foreach; Forvalues; Log files; Merge; Naming conventions; Programs; Repetition; Reshape; Statsby; Subset or group structure; Tabulations; Research Methods/ Statistical Methods. Ano: 2001 URL: http://purl.umn.edu/115938 Registros recuperados: 3 Primeira ... 1 ... Última

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