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Calculating Group Means in a table

Apr 21, 2011 3:04 PM
(2344 views)

Given the first two columns of the following data set:

Group Height GrpMean

Dog 55 55.66666667

Dog 65 55.66666667

Dog 47 55.66666667

Cat 31 29.75

Cat 28 29.75

Cat 25 29.75

Cat 35 29.75

Mouse 12 12.5

Mouse 13 12.5

Is there an easy way to generate the third column (Means for each group)? I realize I can make a "summary table" to generate the requested means (or about a half dozen other methods), but how do I get these means back into the original table, so I can use them for additional calculations? Note that my actual dataset consists of thousands of "Groups" and may not necessarily be sorted nicely as above.

Group Height GrpMean

Dog 55 55.66666667

Dog 65 55.66666667

Dog 47 55.66666667

Cat 31 29.75

Cat 28 29.75

Cat 25 29.75

Cat 35 29.75

Mouse 12 12.5

Mouse 13 12.5

Is there an easy way to generate the third column (Means for each group)? I realize I can make a "summary table" to generate the requested means (or about a half dozen other methods), but how do I get these means back into the original table, so I can use them for additional calculations? Note that my actual dataset consists of thousands of "Groups" and may not necessarily be sorted nicely as above.

4 REPLIES 4

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Re: Calculating Group Means in a table

I think proc sql will work. SAS allows calculations of group values without forcing the grouping.

data work.grouping_test;

input GroupID $ Height;

cards;

Dog 55

Dog 65

Dog 47

Cat 31

Cat 28

Cat 25

Cat 35

Mouse 12

Mouse 13

run;

proc sql;

create table work.example as

select groupid, height, avg(height) as AvgHeight

from work.grouping_test

group by groupid;

run;

produces

Cat 25 29.75

Cat 28 29.75

Cat 35 29.75

Cat 31 29.75

Dog 47 55.666666667

Dog 55 55.666666667

Dog 65 55.666666667

Mouse 13 12.5

Mouse 12 12.5

data work.grouping_test;

input GroupID $ Height;

cards;

Dog 55

Dog 65

Dog 47

Cat 31

Cat 28

Cat 25

Cat 35

Mouse 12

Mouse 13

run;

proc sql;

create table work.example as

select groupid, height, avg(height) as AvgHeight

from work.grouping_test

group by groupid;

run;

produces

Cat 25 29.75

Cat 28 29.75

Cat 35 29.75

Cat 31 29.75

Dog 47 55.666666667

Dog 55 55.666666667

Dog 65 55.666666667

Mouse 13 12.5

Mouse 12 12.5

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Re: Calculating Group Means in a table

I would use Summary, then Update. Either manually or by script.

Example:

Example:

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Re: Calculating Group Means in a table

MS,

That seems to do the trick. Thank you very much!

-SemiChemE

That seems to do the trick. Thank you very much!

-SemiChemE

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Re: Calculating Group Means in a table

clearly...didn't see the jmp forum...sorry.