Date: Mon, 15 Apr 1996 09:45:22 -0400
Reply-To: Claire Durand <durandc@ERE.UMONTREAL.CA>
Sender: "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>
From: Claire Durand <durandc@ERE.UMONTREAL.CA>
Subject: Re: scale development
On Sat, 13 Apr 1996, Shawn Utsey wrote:
> in completing my scale participants are directed to indicate their
> reaction to a given stressful event, if the event has never happened they
> should also indicate this. the scale is as follows: 0=never happened,
> 1=happened, but not upsetting, 2=happened and slightly upsetting, 3=
> happened and upset, and 4 = happened and extremely upset.
> after collecting data based on the above response options i entered the
> data into spss for windows and conducted a principle components factor
> analsis. i entered the data as is. the feedback that i have received is
> that i should have gotten rid of the "0" because they indicate that the
> event did not happen. according to the reveiwer by including the "0" i
> create error variance and create a non-linear distribution.
> can someone tell me how you can get rid of the "0" and not create a
> missing varible, which will cause cases to be excluded. also because
> it is not a missing variable, but part of the scoring scheme.
If you don't want to lose people, the only solution that could be
accepted would be to declare the "0"" as missing and then use the option
"missing=mean substitute" . The rational for this is that you consider
that the "0" are equivalent to "not applicable" i.e. they cannot have a
reaction to something that never occured to them. In substituting the
mean, you adopt a "heuristic solution" because those cases who are
attrributed the mean (I hope they are not too many) will not influence
the factor solution.
Hope this helps...
Claire Durand e-mail: email@example.com
Universite de Montreal