There is a bug in the computation of the p-value for the unequal variance
option in Contrasts of One-way. The output is shown below for a 3-group
design with n = 3 per group and scores of 1,2,3,4,5,6,7,8,9. The reported
p-value is 1.98.
ONEWAY /VARIABLES= score BY group
/CONTRAST= 1 -1 0.
ANOVA
#====================#==============#==#===========#=====#====#
# #Sum of Squares|df|Mean Square| F |Sig.#
#=====#==============#==============#==#===========#=====#====#
#score|Between Groups# 54.00| 2| 27.00|27.00| .00#
# |Within Groups # 6.00| 6| 1.00| | #
# |Total # 60.00| 8| | | #
#=====#==============#==============#==#===========#=====#====#
Contrast Coefficients
#==========#==========================#
# # group #
# #--------+--------+--------#
# # 1.00| 2.00| 3.00#
#========#=#========#========#========#
#Contrast|1# 1| -1| 0#
#========#=#========#========#========#
Contrast Tests
#===============================#=============#========#=====#====#===========#
# Contrast# Value of | Std. | t | df | Sig.
(2- #
# # Contrast | Error | | | tailed)
#
#=====#================#========#=============#========#=====#====#===========#
#score|Assume equal | 1 # -3.00| .82| 3.67| 6|
.01#
# |variances | # | | | |
#
# |Does not assume | 1 # -3.00| .82|-3.67|4.00|
1.98#
# |equal | # | | | |
#
#=====#================#========#=============#========#=====#====#===========#
On Mon, Apr 21, 2014 at 10:33 AM, Douglas Bonett <[email protected]> wrote:
> I am using PSPP in an undergrad social science stat course with 110
> students. These students only use PSPP in GUI mode. We are evaluating PSPP
> as a possible replacement for SPSS in our undergraduate courses. After two
> weeks of use, here are two issues that the students are complaining about:
>
> 1) p-values are displayed in default F8.2 format and they need to report
> them with 3 decimal places. This will be another problem when we get to
> correlations and they need to report correlation estimates with 3 decimals
> (remember they are only using point and click options). Maybe changing to
> F7.3 for p-values and correlations would be an easy fix.
>
> 2) when entering data, they get the following error message when then
> move to a new column:
>
> warning: Data is not valid as format F: Number followed
> by garbage.
>
>
> Both issues are minor but in the minds of these types of students they
> think their program is "broken" or "full of bugs".
>
> Doug
>
>
>
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