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Data processing:
- ALOGIT can be used for a range of simple data processing tasks, using the control language and statistical reporting procedures to give an efficient working environment;
- in particular, files can be output in very flexible ways (e.g. reformatted, respecified, sorted) for processing by other software.
All of these functions are controlled by ALOGIT’s intuitive control file, with
- a very flexible command language, including named variables, intuitively appealing definition structure for hierarchical models, named Boolean operators (TRUE, FALSE, AVAIL etc.);
- include file option for use of external files with command lines or coefficients, streamlining model (estimation) management;
- array definition of alternatives, system data items and variables;
- random number generator (using uniform, normal, logistic distributions or assignment of multinomial variable with specific probabilities);
- ‘if ... THEN ... ELSE... END’ and ‘DO ... END’ syntax, to simplify data transformations;
- intuitive specification of tree logit models using $NEST commands.
mixed logit models, implemented using the flexible ‘error components’ specification, which works with either linear or the exponentiated form, which allows, for instance log-normal disturbances in the coefficients.
problem sizes are not limited by ALOGIT.
组合logit模型只包含在ALOGIT EC中。
ALOGIT 执行以下四个关键功能。
数据输入
可以使用显示偏好或陈述偏好,分类数据或综合数据;可以使用选择、排名或比例分割数据。
输入数据可以自由操作和转换,以允许用户自由地找到所需的行为解释。对输入数据进行广泛的测试,以揭示建模问题;简单的控件,在完全成熟时需要访问。
接受不同格式的多个数据集,连续或使用命名(key)变量链接;支持一些二进制矩阵格式。
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