变量显示到目前为止记录的另一个变量的最高值,随着时间的推移

时间:2018-05-10 13:38:37

标签: stata data-management

我有一个患者及其酒精相关患者数据的数据集随时间(以年为单位),如下所示

clear
input long patid float(year cohort)
1051 1994 1
2051 1972 1
2051 1989 2
2051 1990 2
2051 2000 2
2051 2001 3
2051 2002 1
2051 2003 2
8051 1995 1
8051 1996 1
8051 2003 1
end
label values cohort cohortlab
label define cohortlab 0 "general population" 1 "no alcohol data" 2 "indeterminate" 3 "non-drinker" 4 "low_risk" 5 "hazardous" 6 "AUD" , replace

我想创建一个变量,显示迄今为止在患者记录中任何(年)点使用的最高级别的酒精代码,这样数据集将如下所示:

clear
input long patid float(year cohort highestsofar)
1051 1994 1 1
2051 1972 1 1
2051 1989 2 2
2051 1990 2 2
2051 2000 2 2
2051 2001 3 3
2051 2002 1 3
2051 2003 2 3
8051 1995 1 1
8051 1996 1 1
8051 2003 1 1
end
label values cohort cohortlab
label values highestsofar cohortlab
label define cohortlab 0 "general population" 1 "no alcohol data" 2 "indeterminate" 3 "lifetime_abstainer" 4 "low_risk" 5 "hazardous" 6 "AUD" , replace

2 个答案:

答案 0 :(得分:1)

感谢明确的例子和问题。

StataCorp网站上的常见问题link here已涵盖此问题。这是使用SSC rangestat的单行解决方案。

clear
input long patid float(year cohort)
1051 1994 1
2051 1972 1
2051 1989 2
2051 1990 2
2051 2000 2
2051 2001 3
2051 2002 1
2051 2003 2
8051 1995 1
8051 1996 1
8051 2003 1
end
label values cohort cohortlab
label define cohortlab 0 "general population" 1 "no alcohol data" 2 "indeterminate" 3 "non-drinker" 4 "low_risk" 5 "hazardous" 6 "AUD" , replace

rangestat (max) highestsofar = cohort, interval(year . 0) by(patid) 

list, sepby(patid) 

     +-------------------------------------------+
     | patid   year            cohort   highes~r |
     |-------------------------------------------|
  1. |  1051   1994   no alcohol data          1 |
     |-------------------------------------------|
  2. |  2051   1972   no alcohol data          1 |
  3. |  2051   1989     indeterminate          2 |
  4. |  2051   1990     indeterminate          2 |
  5. |  2051   2000     indeterminate          2 |
  6. |  2051   2001       non-drinker          3 |
  7. |  2051   2002   no alcohol data          3 |
  8. |  2051   2003     indeterminate          3 |
     |-------------------------------------------|
  9. |  8051   1995   no alcohol data          1 |
 10. |  8051   1996   no alcohol data          1 |
 11. |  8051   2003   no alcohol data          1 |
     +-------------------------------------------+

答案 1 :(得分:0)

我想提供一个答案:

by patid: g highestsofar=cohort if cohort>cohort[_n-1]|_n==1
by patid: replace highestsofar=highestsofar[_n-1] if cohort<=cohort[_n-1]&_n>1
by patid: replace highestsofar=highestsofar[_n-1] if (highestsofar<highestsofar[_n-1]) & ((cohort>cohort[_n-1])&_n>1)

label values highestsofar cohortlab

如果可以讨论更紧凑的语法,我会很高兴。

由于