Hi all.
Can anyone advise?
I have 3 different samples of material. The samples are subject to four different loads (N) and they are all affected by temperature and humidity. I want to run tests for how load, temp and humidity affect survival

Is there any test that can do this in one go or do I have to split them into load groups/ material groups etc.

Thanks

------------------------------
Kim Toogood
------------------------------

#SPSSStatistics

OK, it sounds to me like the equation is

Survival = Sample(1,3) + Load(1,4) + temperature + humidity.

What is not clear is whether Load is a within-subjects factor or not. I assume so, that you have 4 measurements of load for each sample, like this: for example:

Case	Sample	Load1	Load2	Load3	Load4	Temperature	Humidity
1	1	3	2	5	6	60	55
2	1	2	4	7	8	62	57

etc. for other cases

Regardless, consider using the GLM procedure for this; do not split them up into separate groups unless you have some statistical or hypothesis-driven reason for doing so.

------------------------------
Rick Marcantonio
Quality Assurance
IBM
------------------------------