Name | Sex | Age | Height | Weight |
Alfred | M | 14 | 69 | 112.5 |
Alice | F | 13 | 56.5 | 84 |
Barbara | F | 13 | 65.3 | 98 |
Carol | F | 14 | 62.8 | 102.5 |
Henry | M | 14 | 63.5 | 102.5 |
James | M | 12 | 57.3 | . |
Jane | F | 12 | 59.8 | . |
Janet | F | 15 | 62.5 | 112.5 |
Jeffrey | M | 13 | 62.5 | 84 |
John | M | 12 | 59 | . |
Joyce | F | 11 | 51.3 | 50.5 |
Judy | F | 14 | 64.3 | 90 |
Louise | F | 12 | 56.3 | . |
Mary | F | 15 | 66.5 | 112 |
Philip | M | 16 | 72 | 150 |
Robert | M | 12 | 64.8 | . |
Ronald | M | 15 | 67 | 133 |
Thomas | M | 11 | 57.5 | 85 |
William | M | 15 | 66.5 | 112 |
in above data weight variable has some missings so we use locf method and fill up missing values and the same time assign dtype=locf like below table
new_weight | Name | Sex | Age | Height | Weight | dtype |
112.5 | Alfred | M | 14 | 69 | 112.5 |
|
84 | Alice | F | 13 | 56.5 | 84 |
|
98 | Barbara | F | 13 | 65.3 | 98 |
|
102.5 | Carol | F | 14 | 62.8 | 102.5 |
|
102.5 | Henry | M | 14 | 63.5 | 102.5 |
|
102.5 | James | M | 12 | 57.3 | . | locf |
102.5 | Jane | F | 12 | 59.8 | . | locf |
112.5 | Janet | F | 15 | 62.5 | 112.5 |
|
84 | Jeffrey | M | 13 | 62.5 | 84 |
|
84 | John | M | 12 | 59 | . | locf |
50.5 | Joyce | F | 11 | 51.3 | 50.5 |
|
90 | Judy | F | 14 | 64.3 | 90 |
|
90 | Louise | F | 12 | 56.3 | . | locf |
112 | Mary | F | 15 | 66.5 | 112 |
|
150 | Philip | M | 16 | 72 | 150 |
|
150 | Robert | M | 12 | 64.8 | . | locf |
133 | Ronald | M | 15 | 67 | 133 |
|
85 | Thomas | M | 11 | 57.5 | 85 |
|
112 | William | M | 15 | 66.5 | 112 |
|
Please post test data in the form of a datastep and clearly describe what it is you are asking. From what you have posted:
data want; set have; dtype="locf"; run;
Gets you the second table, although this isn't what you are wanting is it. Maybe something like:
data want (drop=weight rename=(new_weight=weight)); set have; retain new_weight; if weight ne . then new_weight=weight; else dtype="locf"; run;
Not tested as no test data.
?
Are you asking how to implement locf?
The paper http://www2.sas.com/proceedings/sugi28/099-28.pdf seems to contain a description on how to implement locf.
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