topic Re: Calculating Distribution on Grouped Data in SAS Enterprise Guide

Calculating Distribution on Grouped Data

Charlie_K — Sat, 03 Oct 2015 21:31:02 GMT

I want to run distribution analysis on the attached data file. Data in the column 'Age Group' are the age ranges in a population and the next column indicates the number of people in that respective age range. How can I calculate the distribution analysis to identify mean age and other distribution stats? I can't add the age group as Frequency count as it is a string. Please help. Thank you!

Re: Calculating Distribution on Grouped Data

Reeza — Sat, 03 Oct 2015 22:36:56 GMT

Age Group isn't a frequency isn't a CLASS or BY variable. Add it to the BY or CLASS Group and Population to the ANALYSIS section.

Re: Calculating Distribution on Grouped Data

Charlie_K — Sun, 04 Oct 2015 00:52:51 GMT

Thank you for the reply. If I add the age group to 'Group analysis by', it gives the population mean for each age group. How can I get the mean age or age group of the total population?

Re: Calculating Distribution on Grouped Data

Reeza — Sun, 04 Oct 2015 02:31:50 GMT

Do you have the age variable where it hasn't been grouped/categorized? That would be preferable.

Re: Calculating Distribution on Grouped Data

Charlie_K — Sun, 04 Oct 2015 02:36:05 GMT

Sadly, No. Is there any way I can achieve this with the data I have? Pls help!

Re: Calculating Distribution on Grouped Data

SASKiwi — Sun, 04 Oct 2015 07:05:01 GMT

One approach would be to derive the mid-point of age group and then take the mean of that. You will be calculating the mean of a variable that is not truly continuous, but is probably the best you can do with the data you have.

Re: Calculating Distribution on Grouped Data

Charlie_K — Sun, 04 Oct 2015 14:04:48 GMT

Thank you for your reply! I am not sure how to carry out your solution. Assuming the age group is 0-9, should I take the mean age as 5? That way, if I have 10 age groups (0-9,10-19, 20-29 and so on..) Should I have 10 mean ages? I just want to identify one mean age in my case age group which the Avg age falls into.

Re: Calculating Distribution on Grouped Data

Reeza — Sun, 04 Oct 2015 17:01:33 GMT

Yeah, assign some value to the groups, i.e. 0-4 =1, 5-9=2, etc. Then use proc means with the population as a WEIGHT variable. The value you get, i.e. 2.4 is the group coded to, i.e. 5-9 age group.

Re: Calculating Distribution on Grouped Data

Charlie_K — Sun, 04 Oct 2015 23:26:16 GMT

Hi,

I tried this with a different age data set where I have individual ages and created age groups. I assigned 1,2,3.. to each group and calculated the age mean. Then I calculated the actual age mean with the individual age data set I have. When I compare the actual age mean and the group age mean I got from assigning a number to each group, the individual age mean does not fall into mean age group.

Re: Calculating Distribution on Grouped Data

Reeza — Mon, 05 Oct 2015 14:35:53 GMT

Did you weight the data by the population number?

Re: Calculating Distribution on Grouped Data

Charlie_K — Mon, 05 Oct 2015 15:56:16 GMT

Yes. I multiplied each group number assigned (1,2,3...) by the corresponding population of the group. Is that what you wanted me to do?

Re: Calculating Distribution on Grouped Data

Reeza — Mon, 05 Oct 2015 23:28:46 GMT

No, use the weight option in proc means though I think you'll get similar results. I tested it and it comes close - within 1 category. I'm not aware of a different method but the average of a categorical variable isn't a common request. Consider the median instead thats easier to report/explain anyways.

Re: Calculating Distribution on Grouped Data

Charlie_K — Tue, 06 Oct 2015 01:15:34 GMT

I am sorry, but I am very new to SAS. How should I calculate proc mean in enterprise guide?