You may go to use a data file in Stata and get the error… no room to add more observations r(901); Stata is probably telling you that Stata has not…
Read More

Sometimes you may want to see different marker symbol options to help you construct a graph. You can use the showmarkers command to do this as illustrated in this FAQ….
Read More

Now that Stata 11 has been released, you be wondering if there is an easy way to compute tests of simple main effects? Yes there is and this FAQ will…
Read More

Stata does not have a built-in command to do tests of simple main effects, however ATS has developed a program that will perform them. You can you can the sme…
Read More

This FAQ presents an ado program (smecriticalvalue) that can be used to compute critical values for tests of simple interactions and simple main effects. You can find the smecriticalvalue program…
Read More

Many researchers like to do their anova using regression with dummy coding but wonder how to get tests of simple main effects. This FAQ will show you how to get…
Read More

Recently we received the following question: The output from SAS proc logistic gives a values for Somers’ D. How can I get this using Stata? The Somers’ D, in logistic…
Read More

Sorting columns is easy in Stata but sorting rows is a little trickier. Consider the data shown below with variables v1 through v8 with ten observations. Let’s say that these…
Read More

ATS has created a program called spagplot to help you easily produce spaghetti plots using Stata. You can install spagplot over the internet by typing search spagplot (see How can…
Read More

Say that you use SPSS but wish to know how to do a particular command in Stata. For example, you want to make a new variable and know you can…
Read More