https://github.com/jrfiedler/egen_runmax
Stata package for running max, min, and range
https://github.com/jrfiedler/egen_runmax
Last synced: 17 days ago
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Stata package for running max, min, and range
- Host: GitHub
- URL: https://github.com/jrfiedler/egen_runmax
- Owner: jrfiedler
- Created: 2014-04-15T16:42:49.000Z (about 11 years ago)
- Default Branch: master
- Last Pushed: 2014-04-15T18:34:38.000Z (about 11 years ago)
- Last Synced: 2025-04-30T16:53:26.542Z (17 days ago)
- Language: TeX
- Size: 129 KB
- Stars: 2
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
Stata package for running max, min, and range
=============================================
Installing
----------
You can clone the Git repo with
git clone https://github.com/jrfiedler/egen_runmax
Or you can download a zip archive by clicking on the "Download ZIP" button on the right side of this page.
Syntax
------
**egen** [_type_] _newvar_ = **runmax**(_varname_) [_if_] [_in_] [, _options_]
**egen** [_type_] _newvar_ = **runmin**(_varname_) [_if_] [_in_] [, _options_]
**egen** [_type_] _newvar_ = **runrange**(_varname_) [_if_] [_in_] [, _options_]
_options:_
1. **by**(_varlist_)
- group by specified variables when finding values; the values will be calculated separately in each group implied by _varlist_
2. **sort**(_varlist_)
- sort on specified variables before finding values; the original sort order will be restored afterwards
Description
-----------
These commands generate a variable that contains the running max/min/range of the given numeric variable. Missing values will be excluded; the generated variable will be missing where the source variable was.
If the option **sort**(_varlist_) is specified, then the data is sorted by these variables before calculating the running value, with the original sort order restored afterwards.
If **by**(_varlist_) is specified, then the running value is calculated separately for each group implied by the given varlist. The generated variable will be missing where any **by** variable is missing.
The type of the generated variable (whether specified or default) will be overridden if it seems that a different type is needed to hold the results.
Example usage
-------------
. clear
. input x y
. -2 .
. . .
. 4 0
. 0 1
. -1 0
. -4 1
. 7 0
. . 1
. -5 0
. 3 1
. end
. egen maxx = runmax(x)
(2 missing values generated)
. list
+---------------+
| x y maxx |
|---------------|
1. | -2 . -2 |
2. | . . . |
3. | 4 0 4 |
4. | 0 1 4 |
5. | -1 0 4 |
|---------------|
6. | -4 1 4 |
7. | 7 0 7 |
8. | . 1 . |
9. | -5 0 7 |
10. | 3 1 7 |
+---------------+
. egen maxx_y = runmax(x) , by(y)
(3 missing values generated)
. list
+------------------------+
| x y maxx maxx_y |
|------------------------|
1. | -2 . -2 . |
2. | . . . . |
3. | 4 0 4 4 |
4. | 0 1 4 0 |
5. | -1 0 4 4 |
|------------------------|
6. | -4 1 4 0 |
7. | 7 0 7 7 |
8. | . 1 . . |
9. | -5 0 7 7 |
10. | 3 1 7 3 |
+------------------------+
. list x y maxx_y if y == 0
+-----------------+
| x y maxx_y |
|-----------------|
3. | 4 0 4 |
5. | -1 0 4 |
7. | 7 0 7 |
9. | -5 0 7 |
+-----------------+
. list x y maxx_y if y == 1
+-----------------+
| x y maxx_y |
|-----------------|
4. | 0 1 0 |
6. | -4 1 0 |
8. | . 1 . |
10. | 3 1 3 |
+-----------------+
Author
-----
James Fiedler (jrfiedler at gmail dot com)