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BY statement

Russian translation: оператор BY

18:52 Feb 10, 2020
English to Russian translations [PRO]
Science - Mathematics & Statistics / Клинические исследования
English term or phrase: BY statement
Клиническое исследование. Выполняется статистическая обработка данных.
Вот оригинал:

For each subgroup level of a factor, the HRs and associated CIs will be calculated from a Cox proportional hazards model (ties = Efron) that only contains a term for treatment. The Cox models will be fitted using SAS® PROC PHREG with the Efron method to control for ties and using a BY statement for the subgroup factor.

Вопрос:

Как понять здесь BY statement?

Благодарю заранее :)
Alexander Chernyonok
Local time: 04:35
Russian translation:оператор BY
Explanation:
Речь идет о логическом операторе BY в языке программирования, на котором написана программа обработки результатов исследования

http://www.math.wpi.edu/saspdf/stat/chap49.pdf
The PHREG procedure includes four methods of handling ties. The discrete logistic model is available for discrete time-scale data. The other three methods apply to continuous time-scale data. The exact method computes the exact conditional probability under the model that the set of observed tied event times occurs before all the censored times with the same value or before larger values. Breslow and Efron methods provide approximations to the exact method.
...
BY Statement
BY variables;
You can specify a BY statement with PROC PHREG to obtain separate analyses on observations in groups defined by the BY variables. When a BY statement appears, the procedure expects the input data set to be sorted in order of the BY variables. The variables are one or more variables in the input data set.
Selected response from:

mk_lab
Ukraine
Local time: 04:35
Grading comment
Благодарю вас :)
4 KudoZ points were awarded for this answer



Summary of answers provided
3оператор BY
mk_lab


  

Answers


21 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5
by statement
оператор BY


Explanation:
Речь идет о логическом операторе BY в языке программирования, на котором написана программа обработки результатов исследования

http://www.math.wpi.edu/saspdf/stat/chap49.pdf
The PHREG procedure includes four methods of handling ties. The discrete logistic model is available for discrete time-scale data. The other three methods apply to continuous time-scale data. The exact method computes the exact conditional probability under the model that the set of observed tied event times occurs before all the censored times with the same value or before larger values. Breslow and Efron methods provide approximations to the exact method.
...
BY Statement
BY variables;
You can specify a BY statement with PROC PHREG to obtain separate analyses on observations in groups defined by the BY variables. When a BY statement appears, the procedure expects the input data set to be sorted in order of the BY variables. The variables are one or more variables in the input data set.

mk_lab
Ukraine
Local time: 04:35
Works in field
Native speaker of: Native in RussianRussian, Native in UkrainianUkrainian
PRO pts in category: 296
Grading comment
Благодарю вас :)
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