Presumably that is because it has somehow acquired the corresponding display format. So, a correct summary would be that you misapplied a function.īacking up, you ask why Stata is showing the variable in this way. More crucially, you can only extract substrings from strings and - as Stata is trying to tell you - you are trying to extract a substring from a numeric argument hence the error message type mismatch. In the second case, the expression contains more than 5 sum. (For Small Stata, the limit is 66 dyadic operators.) Break the expression into smaller parts. In Stata functions and commands are quite distinct. In the rst case, you specied an expression that is too long for Stata to processthe expression contains more than 249 pairs of nested parentheses or more than 800 dyadic operators. From there what you do depends on how you want the data to be displayed. so, 'str26' may contain up to 26 characters. Typically, the type is denoted by 'str', with '' being replaced by an appropriate number indicating the maximum length of the string. Any variable in Statas numeric format begins with a sign. But note that as of version 13.0, Stata offers two types of string variables: 'Short' string variables with up to 2045 characters. Numbers in Stata can take a variety of interesting formats, including negative values, decimals and positive and negative scienfitic notation (e.g., 1.0e+2 for a hundred).
STATA SUBSTRING CODE
The last link explains what you should do, namely use dataex (SSC) to show data examples and CODE delimiters to make code readable.įirst, substr() is a function, not a command. Stata Data Formats & Changing Them Numbers. In particular you are enjoined not to post screenshots which are usually unreadable and only very rarely helpful. + String concatenation 'this' + 'that' concatenate the string values this and that - negation sale-discount subtract the value of DISCOUNT from the value of SALE Any arithmetic operation on a missing value or an impossible arithmetic operation (e.g., division by zero) yields a missing value. After 52 posts here this advice should be familiar to you, so please take it.
STATA SUBSTRING MOD
You can probably do this arithmetically (without converting to string) by using a clever combination of floor (), ceil (), and mod () functions, but. The great divide among data types in Stata is between numeric and string variables. Cox University of Durham, UK n.j.coxdurham.ac.uk Abstract. Zeroth, please do read and particularly as we ask all readers to do before posting. The easiest way is to make a string-formatted copy of the data by using the string () function, and then use substr () to subset to a particular set of numeric characters. 314329 Speaking Stata: On numbers and strings Nicholas J.
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