THEN weight_rnd = ROUND(INPUT(weight,BEST. In the below example we use the ? format modifier to first test to see whether the character variable contains a value which is suitable for conversion to a numeric, and then only perform the conversion if this is the case, otherwise a custom warning is written to the log indicating that the input data is not clean and that this should be investigated. If however the value is feasible, perhaps indicating that the test was not perofmed in this instance, then conditional programming can be used to indicate that the character to numeric conversion should only be performed on suitable input values, for example: If the value of “U” is unexpected and perhaps indicates dirty data, then the best approach is usually to request that the input dataset is queried. Indicating that at observation 2 the variable WEIGHT contained a value “U” which was unsiotable for the INPUT function. NOTE: Invalid argument to function INPUT at line 36 column 22. In this instance the log will show something similar to the following: The second observation of this dataset would cause _ERROR_ variable to be set to 1 as the INPUT function tries to convert the character value “U” to a number. Consider the following example: DATA vitals Weigth_st = 0.157473 * INPUT(weight_kg,BEST.) Ĭare should be taken with this approach however, in case the character variable contains values unsuitable for a numeric conversion. Going back to our example, this would involve using an INPUT function to convert the variable WEIGHT_KG to a numeric before the calculation takes place as follows: DATA weight To avoid the note being written to the log, you can explicitly perform the character to numeric conversion. NOTE: Character values have been converted to numeric values at the places given by: Here the character variable “75″ is converted to a numeric variable and the statement executes giving the expected result, but writing a NOTE to the log explaining that SAS has had to perform an implicit conversion in order for the calculation to take place. SAS automatically converts the variable from character to numeric so that the calculation can take place). In this instance SAS will perform an implicit conversion (i.e. A character variable WEIGHT_KG is created and assigned the value “75″, the subsequent statement attempts to use this character variable in a numeric calculation. Here we look at a few example where this implicit conversion is performed and look at ways in which the programs can be updated to avoid the NOTE.Ĭonsider for example the following DATA step. Implicit conversions also take more CPU time than explicit conversions and so may cause your program to execute more slowly. It is possible to rely on SAS to perform these conversions imlpicitly, however, in general this is not considered good programming practice and it is usually preferable to perform these conversions explicitly. If you try to do something to a character variable that should only be done to a numeric variable. This message occurs when you try to perform a numeric calculation using a character variable, or to assign a character value to a variable which has already been defined as numeric. The reality though is that SAS is a pretty smart application. Newdates(i) = input(strip(olddates(i)),yymmdd10.In the last two posts we looked at how to clean the log by removing SAS NOTEs, here we look again at what to do when your log contains the following message: NOTE: Character values have been converted to numeric values. Run Real SAS Date values are numeric so numeric array is created for them. Suppose you need to convert multiple character variables to SAS datevalue format. to convert character values in DD-MMM-YYYY format.Ĭonvert Multiple Character Variables to Date How to convert character dates of DD-MMM-YYYY or DD/MMM/YYY format? format directly as SAS reads 14 as month which is not possible. For example, cannot be converted to DDMMYY10. If you put the different date format in INPUT function, it may lead to missing value. Make sure you put the original date format in INPUT function and put the desired date format in FORMAT statement. If we need to convert it to Date-Month-Year format and stored as in SAS date format.ĭateofbirth2 = input(strip(dateofbirth), MMDDYY10.) Output : Convert Character Variable to DateĪs you can see our original dateofbirth variable is in Month-Date-Year format but stored as a character. If you use the same variable for conversion, the format of the variable would remain character. Run Important Note : Please make sure a new variable is created for conversion. Dateofbirth2 = input(strip(dateofbirth),MMDDYY10.)
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |