Viswa Chandu

8 Questions 66 Answers 0 Followers

Questions related from Viswa Chandu

In matched case control studies, what is the statistical test of choice to check differences in a continuous variable?

It is identified in some pieces of text I have read that paired t test is used to compare between cases and matched controls with regard to a continuous variable. Is this correct and how is this...

29 March 2021 5,127 2 View

An item has loadings of 0.715 and 0.174 on factor 1 and 2 respectively in the unrotated matrix. With promax, it has higher loading on factor 2. Why?

In an EFA with 8 items, two factors were extracted. Five items have higher loadings on factor 1 and two items have more loadings on factor 2 in both the unrotated and promax-rotation matrices....

13 April 2020 9,089 5 View

Which is the best method to account for random guessing in knowledge tests?

I have a question with 12 options. Respondents are allowed to choose multiple options. Among these 12 options, 6 are correct responses and 6 are not. I want to penalize the respondent if an...

26 March 2020 3,536 3 View

Want to predict when an outcome occurs based on the values of four influencing parameters. How do I estimate sample size here?

In this case outcome is inevitable. There would not even be one case where the outcome doesn't occur. The intention is to develop a model that predict when that outcome occurs based on a set of...

09 January 2019 8,410 6 View

What is the median for a distribution: "70, 73,74, 75, 75, 75, 75, 80"?

Some statistical literature says it to be 74.75. I am thinking that the emphasis given for tied scores affecting the median values doesn't make much difference practically based on the magnitude...

07 January 2019 464 2 View

Decision on retaining an item based on differential item functioning (DIF)

We are developing a scale with Likert items. There is an item which loaded very well on factor 1 in PCA. After determining the factor structure, I thought of observing the gender DIF patterns and...

01 January 1970 5,355 3 View

How to deal with mixed type of variables in K-means clustering

If I have ordinal and interval scale variables, Can I use the standardized values of these variables in K-means clustering?

01 January 1970 2,649 6 View

An item has loadings of 0.715 and 0.174 on factor 1 and 2 respectively in the unrotated matrix. With promax, it has higher loading on factor 2. Why? N

In an EFA with 8 items, two factors were extracted. Five items have higher loadings on factor 1 and two items have more loadings on factor 2 in both the unrotated and promax-rotation matrices....

01 January 1970 7,694 0 View