- What is the difference between numeric and string variables?
- What is a numeric variable?
- What is a float variable Stata?
- What are 3 types of variables?
- Is age categorical or numerical?
- What is a double variable in Stata?
- What does _n mean in Stata?
- What is encode in Stata?
- What is int float STR?
- Is age a string or numerical?
- What is a string variable in Stata?
What is the difference between numeric and string variables?
Numeric variables contain only numbers and are suitable for numeric calculations such as addition and multiplication.
String variables may contain letters, numbers and other characters.
You can’t do calculations on string variables -even if they contain only numbers..
What is a numeric variable?
Numeric variables have values that are numbers (in standard format or scientific notation). Missing numeric variables appear as a period (i.e., “.”). Example: Continuous variables that can take on any number in a range (e.g., height, weight, blood pressure, …) would be considered numeric variables.
What is a float variable Stata?
For example, float variable type data will be stored with a 7-digit level of accuracy. This means that Stata will not round a number stored as a float type, as long as the number is 7 total digits or fewer. If precision is needed past the 7- digit limit, however, the “double” storage type should be used.
What are 3 types of variables?
A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.
Is age categorical or numerical?
In our medical example, age is an example of a quantitative variable because it can take on multiple numerical values. It also makes sense to think about it in numerical form; that is, a person can be 18 years old or 80 years old.
What is a double variable in Stata?
If the identification numbers are integers and take 9 digits or less, store them as longs; otherwise, store them as doubles. doubles have 16 digits of accuracy. Stata stores numbers in binary, and this has a second effect on numbers less than 1.
What does _n mean in Stata?
current observation numberStata has two built-in variables called _n and _N. _n is Stata notation for the current observation number. … _N is Stata notation for the total number of observations.
What is encode in Stata?
Description. encode creates a new variable named newvar based on the string variable varname, creating, adding to, or just using (as necessary) the value label newvar or, if specified, name.
What is int float STR?
Integer ( int ): represents positive or negative whole numbers like 3 or -512. Floating point number ( float ): represents real numbers like 3.14159 or -2.5. Character string (usually called “string”, str ): text. Written in either single quotes or double quotes (as long as they match).
Is age a string or numerical?
Variables come in two basic types, viz: numeric and string. Variables such as age, height and satisfaction are numeric, whereas name is a string variable. String variables are best reserved for commentary data to assist the human observer. However they can also be used for nominal or categorical data.
What is a string variable in Stata?
String variables, simply speaking, are variables that contain not just numbers, but also other characters (possibly mixed with numbers).