I think John is saying that in SPSS/PSPP you need to use a statistical

function to generate statistical results like a CI. For example, T-TEST

will produce a 95% CI for the mean difference in independent-samples

t-tests. Other routines may provide other confidence intervals.

But maybe you want to use compute to create a variable for each case:

compute LB = x - 1.96 * 10.1/sqrt(31).

compute UB = x + 1.96 * 10.1/sqrt(31).

This creates variables LB and UB for all cases in your data file and you

need to supply Z, mean, SD, and n.

Connecting that to your query about AGGREGATE, which takes groups of

cases (defined by unique values on BREAK) and creates summary stats, you

could use AGGREGATE to create mean, SD and n in the above equation and

then use those compute statements to calculate the bounds of the CI for

the groups of cases. So, you would have to do two steps. First an

AGGREGATE command that creates mean, SD and n, followed by the two

computes above.

You would end up with a dataset containing the mean, sd, n, LB, and UB

for each group (defined by a unique value of BREAK) in the original dataset.

Hopefully you only have one variable (or a very few) in the data that

you want this on, because you have to create mean, SD and n for each

variable.

-Alan

*Post by Mark Hancock*I unfortunately don't know enough about PSPP syntax to suggest how to

do this, but a CI is *not*Â always associated with a hypothesis and can

be calculated from just a mean and SD (and a cumulative distribution

function, which is typically the normal one). Typically the formula is

meanÂ Â± z(SD/sqrt(n)), where z is from the CDF.

On Fri, Oct 12, 2018 at 6:29 AM John Darrington

The confidence interval is a concept associated with a hypothesis.

If it's the confidence interval on the test for a mean value, typically you

would get that by using a T-Test.

Â Â Â Folks,

Â Â Â I would like to get a 95% confidence interval so that I could

use it

Â Â Â in AGGREGATE, e.g.,

Â Â Â Â AGGREGATE OUTFILE * MODE ADDVARIABLES

Â Â Â Â Â /BREAK=...

Â Â Â Â Â /Mean = mean(V)

Â Â Â Â Â /CI = ci(V, 0.95)

Â Â Â What must I do to get the result of my hypothetical `ci'

function?

Â Â Â I'm a PSPP novice, so maybe there is a better solution than

AGGREGATE

Â Â Â ??? what I ultimately want is to emit the confidence interval

of a

Â Â Â variable to a CSV file using SAVE TRANSLATE.

Â Â Â Â Â Werner

Â Â Â _______________________________________________

Â Â Â Pspp-users mailing list

Â Â Â https://lists.gnu.org/mailman/listinfo/pspp-users

--

Avoid eavesdropping.Â Send strong encrypted email.

PGP Public key ID: 1024D/2DE827B3

fingerprint = 8797 A26D 0854 2EAB 0285Â A290 8A67 719C 2DE8 27B3

See http://sks-keyservers.net or any PGP keyserver for public key.

_______________________________________________

Pspp-users mailing list

https://lists.gnu.org/mailman/listinfo/pspp-users

_______________________________________________

Pspp-users mailing list

https://lists.gnu.org/mailman/listinfo/pspp-users

--

Alan D. Mead, Ph.D.

President, Talent Algorithms Inc.

science + technology = better workers

http://www.alanmead.org

"You're an interesting species. An interesting mix.

You're capable of such beautiful dreams, and such

horrible nightmares. You feel so lost, so cut off,

so alone, only you're not. See, in all our

searching, the only thing we've found that makes

the emptiness bearable, is each other."

-- Carl Sagan, Contact