What does Bysort mean?
by and bysort are really the same command; bysort is just by with the sort option. The varlist1 (varlist2) syntax is of special use to programmers. It verifies that the data are sorted.
What is a type mismatch error in Stata?
A type mismatch means that you trying to do something numeric to strings, or vice versa. In your examples, possibly year is a string variable somehow. If so, destring year, replace. On debugging: Stata will stop with an error message as soon as it hits a problem.
What does _n mean in Stata?
the current observation number_n is Stata notation for the current observation number. _n is 1 in the first observation, 2 in the second, 3 in the third, and so on. _N is Stata notation for the total number of observations.
How do you write not equal to in Stata?
The relational operators are > (greater than), < (less than), >= (greater than or equal), <= (less than or equal), == (equal), and != (not equal).
How do you Destring a variable?
1:153:34Data management: How to convert a string variable to a numeric variableYouTubeStart of suggested clipEnd of suggested clipMaybe there are characters that appear in that variable that I want I don't want to be there I couldMoreMaybe there are characters that appear in that variable that I want I don't want to be there I could remove them. And I can convert non numeric strings to missing values treat commas as decimals.
What does type mismatch mean in access?
This error indicates that Access cannot match an input value to the data type it expects for the value. For example, if you give Access a text string when it is expecting a number, you receive a data type mismatch error.
How do I find a specific observation in Stata?
To refer to a variable in Stata, you simply type its name. To refer to a particular observation in a variable, you type varname[n], where n is the observation number. For example, observation 7 in variable GDP could be called by typing GDP[7].
How do you create panel data?
0:4613:04(Stata13): Tips to Building Panel Data in Stata #paneldata ... - YouTubeYouTubeStart of suggested clipEnd of suggested clipSee 4 categorize the Abscam variable to explore the basic features in their data tip 5 creates dummyMoreSee 4 categorize the Abscam variable to explore the basic features in their data tip 5 creates dummy variables you can create as many crummy variables as you like depending on your research.
What does the group function do in Stata?
The group function numbers the groups formed by crossing sex and marital. The groups are numbered consecutively which makes this a good variable to use in analysis. The label option causes Stata to use the value labels (if any) of sex and marital.
How do I do math operations in Stata?
The arithmetic operators in Stata are + (addition), - (subtraction), * (multiplication), / (division), ^ (raise to a power), and the prefix - (negation). Any arithmetic operation on a missing value or an impossible arithmetic operation (such as division by zero) yields a missing value.
How do I do an IF THEN statement in Stata?
0:152:58Using if Statements in Stata - YouTubeYouTubeStart of suggested clipEnd of suggested clipThe syntax for using if statements is command if conditions comma options by command I mean a stateMoreThe syntax for using if statements is command if conditions comma options by command I mean a state a command like any you'd. Use.
What does syntax mean in Stata?
Syntax is the grammar of Stata commands. [by varlist]: command [varlist] [=exp] [if exp] [in range] [weight] [using filename][, options] Except for the command itself, everything else in the brackets are optional. [by varlist] repeats the command on each subset of data.
Why is data red in Stata?
It's a common mistake when importing data to accidentally make Stata think a numeric variable is a string. The values of string variables are red in the data browser (like make in this data set) so if you start seeing red where you shouldn't you know you've got a problem.
What does a period mean in Stata?
missing valuesThis shows that Stata can store categorical data as numbers but display human-readable text. This is done by what Stata calls value labels. Finally, under the rep78 variable, which looks to be numeric, there are some cells containing just a period (.). The periods correspond to missing values.
What does exclamation mark mean in Stata?
negation characterThe negation character in Stata is the exclamation mark "!". Stata allows you to run a regression for a subsample using the if qualifier.
Can you undo a command in Stata?
It's also very difficult to recover from mistakes—there's no "undo" command in Stata. The other approach is to treat Stata as a programming language. In this approach you write your programs, called do files, and run them.