Question Regarding Homework
I did the practice homework correctly, but for some reason I am having a really hard time starting the actual homework. I am trying to "select cases" and do the t-test between two levels but every time I select cases and put in LT 2 or LT 1 it crosses out all of them. How can I select the right levels?
Thanks!
posted by ashleynevin @ 9:10 PM
3 Comments:
At 10:23 PM,
Grace said…
Hi Ashley,
The LT is "less than" in SPSS lingo. So you should enter LT 3 if you actually want to select levels 1 & 2. Or you can choose < = 2, which is SPSS' way of saying "less than or equal to."
Hope that helps!
At 12:33 AM,
ashleynevin said…
Thank you so much!
At 6:55 PM,
Mari Clements said…
A couple of more hints.
Just as LT = less than, LE = less than or equal to, GT is greater than, and GE is greater than or equal to.
Be very careful in applying these transformations, because SPSS will do exactly what you tell it to, even if your directions are incomplete or contradictory. So, for instance if...
...you tell SPSS to recode a variable such that values less than 2 are in group 1 and values greater than 2 are in group 2, individuals with scores of exactly 2 will be in neither group.
...you tell SPSS to recode a variable such that values less than or equal to 2 are in group 1 and THEN tell SPSS that values greater than or equal to 2 are in group 2, folks with values of exactly 2 will be in group 2, but...
...if you tell SPSS to recode a variable such that values greater than or equal to 2 are in group 2 and THEN tell SPSS that values less than or equal to 2 are in group 1, folks with values of exactly 2 will be in group 1. That is, SPSS will implement the transformations in the order you give them, so it is entirely possible to undo a transformation.
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