Independent t-Test error

[KevinB]

First time using IBM Stats. Having trouble running independent t-test. This is the output log:

T-TEST GROUPS=Group(1 2)
/MISSING=LISTWISE
/VARIABLES=Time_To_First_Rescue Total_Rescue_Doses Length_Of_Stay
/CRITERIA=CI(.95).

T-Test

Warnings
The Independent Samples table is not produced.


Group Statistics
Group N Mean Std. Deviation Std. Error Mean
TTFR treatment 41 143.0807 80.12217 12.51298
control 0a . . .
TRD treatment 41 31.585 22.2328 3.4722
control 0a . . .
LoS treatment 41 20.463 3.2023 .5001
control 0a . . .
a t cannot be computed because at least one of the groups is empty.

[Rich Ulrich]

On Wed, 27 May 2020 15:10:18 -0700 (PDT), KevinB
It tells you, "at least one of the groups is empty."

That is a very strong clue ....

You have specified that the two groups are coded 1 and 2.
(I would have put a comma between them, but that's
probably not any problem.)

You can do a FREQUENCIES to see how Group is coded in your data.

Post by KevinB
T-TEST GROUPS=Group(1 2)
/MISSING=LISTWISE
/VARIABLES=Time_To_First_Rescue Total_Rescue_Doses Length_Of_Stay
/CRITERIA=CI(.95).
T-Test
Warnings
The Independent Samples table is not produced.
Group Statistics
Group N Mean Std. Deviation Std. Error Mean
TTFR treatment 41 143.0807 80.12217 12.51298
control 0a . . .
TRD treatment 41 31.585 22.2328 3.4722
control 0a . . .
LoS treatment 41 20.463 3.2023 .5001
control 0a . . .
a t cannot be computed because at least one of the groups is empty.