Confidence Interval for mean or proportion (percent) using SPSS.

#1
Can somebody tell me what's software, script to use for process the confidence interval (percent or/and mean) over SPSS base?
Thank you for your answer.
Gregoire VOLNY
 

Toke

New Member
#2
To calculate the confidence interval for mean in SPSS, you can use the EXPLORE function. I use the following syntax.

EXAMINE
VARIABLES=variable
/PLOT NONE
/STATISTICS DESCRIPTIVES
/CINTERVAL 95
/NOTOTAL.

As far as I know there is no simple way to calculate the confidence interval for proportion. I usually do it by hand or in a spreadsheet.

With kind regards
Toke Arndal
Stud. scient. pol.
 

mp83

TS Contributor
#3
If using R there are a handful of options

Packages
Code:
binom: Binomial Confidence Intervals For Several Parameterizations

Constructs confidence intervals on the probability of success in a 
binomial experiment via several parameterizations
> http://cran.r-project.org/src/contrib/Descriptions/binom.html

Code:
binMto: Asymptotic simultaneous confdence intervals for 
many-to-one comparisons of proportions

Asymptotic simultaneous confidence intervals for comparison 
of many treatments with one control, for the 
difference of binomial proportions, allows for 
Dunnett-like-adjustment, Bonferroni or unadjusted intervals. 
Simulation of power of the above interval methods, approximate 
calculation of any-pair-power, and sample size iteration based on 
approximate any-pair power. Exact conditional maximum 
test for many-to-one comparisons to a control.
> http://cran.r-project.org/src/contrib/Descriptions/binMto.html

Also, functions
Code:
varbin
binconf
binom.test