Of course, the first thing we always do when trying to read data from a raw data file into a SAS data set is to review the data to determine whether we need to use column, formatted, or list input to read in the data values. There are some situations, however, in which just one input method doesn't do the trick. In those cases, we'll want to consider mixing input styles, that is, using more than one input method simultaneously. Let's take a look at an example!
Example 20.17 Section
The following program illustrates using column input, list input, and formatted input simultaneously to read in data concerning five U.S. national parks:
DATA nationalparks; input ParkName $ 1-22 State $ Year @40 Acreage comma9.; DATALINES; Yellowstone ID/MT/WY 1872 4,065,493 Everglades FL 1934 1,398,800 Yosemite CA 1864 760,917 Great Smoky Mountains NC/TN 1926 520,269 Wolf Trap Farm VA 1966 130 ; RUN; PROC PRINT data = nationalparks; format acreage comma9.; RUN;
Reviewing the data, you can see that:
- Column input is an appropriate method for the first field (ParkName) because the values can be read as standard character values and are arranged in a neatly defined column.
- The next two fields are candidates for list input, as they are separated by a single blank while the first (State) contains standard character values and the second (Year) contains standard numeric values.
- The values in the last field (Acreage) are arranged in a neatly defined column, but the values require an informat. Therefore, formatted input is an appropriate method.
As you can see by the INPUT statement, mixing the input styles is easily achieved just by simply using the different methods within the same INPUT statement. Launch and run the SAS program, and review the output to convince yourself that SAS read in the data properly.