What does nway mean in SAS?

NWAY. specifies that the output data set contain only statistics for the observations with the highest _TYPE_ and _WAY_ values. When you specify class variables, this corresponds to the combination of all class variables. Interaction: If you specify a TYPES statement or a WAYS statements, PROC MEANS ignores this option …

What is the use of nway In Proc means?

Using the NWAY option instructs PROC MEANS to output only observations with the highest value of _TYPE_ to the new data set it is creating. Proc Means Data = test nway noprint; By default, PROC MEANS will analyze the numeric analysis variables at all possible combinations of the values of the classification variables.

What is difference between proc means and proc summary?

Proc SUMMARY and Proc MEANS are essentially the same procedure. Proc MEANS by default produces printed output in the LISTING window or other open destination whereas Proc SUMMARY does not. Inclusion of the print option on the Proc SUMMARY statement will output results to the output window.

What is _TYPE_ in Proc Summary?

The variables _FREQ_ and _TYPE_ are automatically added to the summary data set when the OUTPUT statement is used. _FREQ_ is the count of the number of observations available for use and _TYPE_ is a numeric flag which indicates the subgroup of the CLASS variables summarized by that observation in the output data set.

What is the meaning of Nway in Proc summary?

PROC MEANS NWAY; where NWAY specifies that the output will contain statistics for the combination of all specified class variables (the observations that have the highest _TYPE_ value). Popular Trending

What are some of the options in Proc summary?

The syntax of PROC SUMMARY is quite extensive. The following is a partial list of some of the statements and options available on PROC SUMMARY: PROC SUMMARY DATA=SASdataset options; Options (partial list): MISSING NWAY DESCENDING ORDER= -Treat missing values as a valid subgroup value -Calculate only highest level of interaction

How to add missing to a proc summary?

If you want missing to be treated as a valid level of you class variable add the MISSING option to the class statement. You didn’t request any summary functions for the variable. Request the statistics on the output statement. I did it adding missing as an option of proc summary…I think will be the same.

Is the Nway option omitted unless you add the missing option?

And as you have noted, missing values for CLASS variables are omitted unless you add the MISSING option. You’re right about that. NWAY has no impact, unless a CLASS statement is present. To see the impact, try removing NWAY and see what changes.