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 &...

31 December 2018 4,204 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.

06 July 2017 4,706 0 View

No title

10 November 2016 7,039 10 View

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

02 March 2016 7,360 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

01 February 2016 572 6 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...

06 July 2015 7,196 8 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.

06 July 2015 4,710 12 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?

31 December 2014 4,841 13 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...

31 December 2014 8,396 8 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

03 April 2014 1,295 6 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

VIF very high, but correlation is low and coefficient is significant. Which one whould I choose?

Hello. I have a question whether if my coefficients (statistically significant) would be valid when VIFs are really high. In my model, there are independent variables(IV), moderating variables...

26 February 2021 956 13 View

Data Analysis K-S and S-W tests?

Hello, I have conducted analysis where the K-W and S-W have come out as p

25 February 2021 9,648 3 View

Statistics: include groups of respondents made by one person for analysis?

Good morning, I could not find literature about this so I am asking. I am organizing data for a questionnaire (N=100) that foresees some personal questions like level of education. For the aim...

25 February 2021 2,090 4 View

Which is the best software or programming language (user friendly) for analysing data?

I have a basic knowledge on Python, R and MATLAB in analysing data. Among those, which is the best and user friendly? Which one should I learn deeply to analyse data?N:B: I want to learn data...

20 February 2021 3,950 15 View

Is the box plot of climatic indices better illustrate from daily data or annual data?

Hello, I hope you have a good time. I work on a research project about temperature indices. Due to the high number of indices, I only work on tables and maps on an annual time scale. In other...

19 February 2021 9,742 2 View

ANCOVA controlling baseline in RCT - how to perform power analysis and sample size estimation?

Hi, I have a simple question. I am hoping to perform a power analysis/sample size estimation for an RCT. We will be controlling for baseline symptoms, and using post-treatment or change scores as...

19 February 2021 2,648 23 View

How to find if Qualitative and Quantitative (discrete) variables have a relation?

I'm going to do a brief research about the dependance between the number of cases of Covid-19 and sex( male/female) . One of the requierements is to use inferential statistics to test the...

18 February 2021 7,092 11 View

Algorithms to filter corrective max and min from a set of data?

I've got this 5 year Direct Normal Irradiance data I downloaded from https://re.jrc.ec.europa.eu/. I ordered this by year and by every 24 hours because I need the DNI curve by max in summer, min...

17 February 2021 2,777 5 View