F Spss. F value variation between sample groups variation within sample groups. You are looking at whether you have more variation between your groups instead of within your groups.
This will be enough for majority of research done in spss. Spss free and safe download. However back to your question f value in anova for example is the following proportion.
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Organizations use spss statistics to understand data analyze trends forecast and plan to validate assumptions and drive accurate conclusions. F value variation between sample groups variation within sample groups. This will be enough for majority of research done in spss. It is also used by market researchers health researchers survey companies government education researchers marketing organizations data miners and others.