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| Registros recuperados: 63 | |
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| Cox, Nicholas J.. |
| The term spineplot has been applied over the last decade or so to a type of bar chart used particularly for showing frequencies, proportions, or percentages of two cross-classified categorical variables. The principle is that the areas of rectangular tiles are proportional to the frequencies in the cells of a contingency table. Often both coarse and fine structure are easy to see, including departures from independence. The main idea has, in fact, been rediscovered repeatedly over at least the last 130 years. In its most general form, it has been widely publicized under the name mosaic plots. This column introduces, discusses, and exemplifies a Stata implementation of spineplots. It is noted that a restriction to two variables is more apparent than real,... |
| Tipo: Article |
Palavras-chave: Spineplots; Mosaic plots; Bar charts; Graphics; Categorical data; Research Methods/ Statistical Methods. |
| Ano: 2008 |
URL: http://purl.umn.edu/120931 |
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| Cox, Nicholas J.. |
| Spells in time series (and more generally in any kind of one-dimensional series) may be defined as sequences of observations that are homogeneous in some sense. For example, a categorical variable may remain in the same state, or values of a measured variable may satisfy the same true–false condition. Devices for working with spells in Stata include marking the start of each spell with indicator variables and tagging spells with integer codes. Panel data are easy to handle with the by: prefix. Some kinds of spell identification require two passes through the data, as when only spells of some minimum length are of interest or short gaps are tolerable within spells. Many questions concerning spells are easy to answer given careful use of by: and appropriate... |
| Tipo: Article |
Palavras-chave: Spells; Runs; Time series; Data management; Research Methods/ Statistical Methods. |
| Ano: 2007 |
URL: http://purl.umn.edu/119273 |
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| Cox, Nicholas J.. |
| Three commands in official Stata, foreach, forvalues, and for, provide structures for cycling through lists of values (variable names, numbers, arbitrary text) and repeating commands using members of those lists in turn. All these commands may be used interactively, and none is restricted to use in Stata programs. They are explained and compared in some detail with a variety of examples. In addition, a self-contained exposition is given on local macros, understanding of which is needed for use of foreach and forvalues. |
| Tipo: Journal Article |
Palavras-chave: Foreach; Forvalues; For; Lists; Local macros; Substitution first; Research Methods/ Statistical Methods. |
| Ano: 2002 |
URL: http://purl.umn.edu/115962 |
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| Registros recuperados: 63 | |
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