Forough Mortazavi

12 Questions 32 Answers 0 Followers

Questions related from Forough Mortazavi

How to do a repeated measure anova in spss with two unmatched groups?

We conducted an intervention study with three measurements of fear in three time points. Results showed that two groups were not matched for two demographic variables (education level &...

01 January 2019 4,258 3 View

How can I replace missing values in SPSS with the means of a number of items?

In the process of doing a CFA, I have to replace the missing values with the means of 11 items. I wonder if there is a solution in SPSS.

07 July 2017 4,790 0 View

What is Youden’s index (J) and its usage?

I am evaluating the validity of a test by calculating its sensitivity, specificity, PPV, and NPP. I was asked to calculate Youden’s index (J) by this...

11 November 2016 7,087 10 View

Does reverse worded items in questionnaire desighning influence its construct validity or reliability?

I ran an EFA on the 14-item scale. results showed 4 factors, with two factors consisted of positive-worded items and two factors consisted of negative-worded items. it seems that in addition to...

03 March 2016 7,429 17 View

Are yielding good fit indices enough for concluding that a structure for a scale is acceptable? Are factors correlations important?

I run a CFA on a 14-item scale. Although the fit indices are relatively good (RMSEA= 0.066 (CI [0.053, 0.078]), SRMR=0.069, Chi-square/df=2.71, P

02 February 2016 644 6 View

How can we assess the ceiling effect or floor effect of a questionnaire?

Referees usually asks about the existence of ceiling effect or floor effect in the process of instrument development. I am interested to find the way I can statistically assess them.

07 July 2015 4,798 12 View

Is there any cut off value for Childbirth Attitudes Questionnaire which measure fear of childbirth??

The Childbirth Attitudes Questionnaire was validated in Farsi. it is recommended to use cut off value=28 for identifying fear of childbirth. I could not find any references indicating so. It is...

07 July 2015 7,259 8 View

Does ceiling effect of the items of a questionnaire influence the results of Factor analysis?

The questionnaire I worked on consists of 49 items rating on a 6 point likert scale. I found that most participants chose the highest point of many items. However, the results of CFA are good? Is...

01 January 2015 8,488 8 View

Is it essential to assess normality of items before doing factor analysis?

My questionnaire composed of 49 items. none of them are normally distributed. Is it correct to do a CFA or EFA with non- normal data?

01 January 2015 4,885 13 View

Can anyone make suggestions for using the crosswise method?

I am interested in designing questions for assessing sensitive domains. I know that the Crosswise method is suitable, but I do not know how it works.

06 June 2014 5,194 4 View

Is there any reference indicating that the low number of items of a subscale of an instrument is related to unsatisfactory Alpha coefficient value?

alpha Cronbach < .6

04 April 2014 1,405 6 View

Cultural adaptation of an instrument: What are your views on this?

Is it necessary to assess both essentiality (necessity) and relevancy of the items of a valid instrument, which is translated into another language for cultural adaptation? Don't they mean the...

04 April 2014 935 3 View