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#Stata 13 commands list how to
If your variable is binary as opposed to continuous, i.e., consists of zeroes and ones, then add the option "binomial" as in "ci VARNAME, binomial level(98)." There are various options for how to calculate binomial confidence intervals these are described in online help. Use the command "ci." For example, to make a 98% confidence interval for a continuous variable called VARNAME, enter "ci VARNAME, level(98)." Note the use of the level option to specify the level of the desired confidence interval. These values can be scaled to arbitrary intervals, i.e., "generate x1 = x*10" after assigning x as before will generate x1 from a uniform distribution on the interval from zero through ten. The command "generate x = uniform()" will draw random values from the unit interval. How do I generate a list of random numbers from a uniform distribution? Typing "correlate" without any arguments produces a correlation matrix for all variables.
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Which will produce a k X k correlation matrix. How do I calculate the correlation between two variables? Which will produce a 2 x 2 correlation matrix. In other words, "ttail (5,2)" will generate an error but "ttail(5,2)" will not. Make sure that function calls do not have spaces after arguments. Similarly,display invttail (5.05) will return the critical value from a t distribution with 5 degrees of freedom such that the area to the right of the value is 0.05.NOTE: Stata is very picky about spaces. For example,display ttail(5,2)will return the upper tail area (to the right of 2) of a t distribution with 5 degrees of freedom. Also, use the function invttail(n,p) where p is a right tail area from a t distribution with n degrees of freedom. Use the function ttail(n,t) where n is degrees of freedom and t is the critical value of interest. How do I use Stata to calculate tail areas and critical values for the t distribution? The use of y is generic, and any acceptable label will work. To compute the inverse tail area for an area equal to p, use the following command: To compute the left tail area for a given z value, use the following command: How do I have Stata report normal tail areas and inverse normal tail areas? Another way to drop delete observations is to use an if" clause.įor example, "drop if VARNAME5" and so forth. Similarly, you can type "drop in 1/3" to drop the first three observations. If you type "drop in 5" then the 5th observation will be deleted. Suppose that a data set has 10 observations. How do I delete observations from a data set? Also, add the option detail, as in "summarize, detail" or Which will give you a summary of the variable VARNAME. Use the command "summarize." You can simply type "summarize," in which case you will get means, standard deviations, and so forth for all variables in memory. How do I calculate means, variances, and standard deviations? " and "cd NAMEHERE" commands to move anywhere you want in your hard disk (NAMEHERE refers to a folder into which you want to move remember to enclose NAMEHERE in quotes if necessary). Important note! If your folder name has a space in it, you have to enclose the name in quotes. If your current working directory has a folder called "myfolder" in it and if you want to change your working directory to "myfolder," type "cd myfolder." This, for example, could move you from "/Home/Users/johndoe/Stata" to /Home/Users/johndoe/Stata/myfolder." " then you will be in /Home/Users/johndoe. "įor instance, if you are in /Home/Users/johndoe/Stata and you type "cd.
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To move up one level in your directory tree, type "cd.To see the files and folders in your working directory, type "ls".To see what your current working directory is, type "pwd".Your working directory is the directory or folder in which Stata looks when you give it a disk access command. Details How do I set my working directory?