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1answer
37 views

How to calculate max/min scales on a scatter plot

I have 3 log scatter plots that I want to establish smooth maximum and minimum lines. What is the usual mathematical method to do that? (Image and Excel file links below.) The black lines on the ...
2
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1answer
75 views

How to solve the problem, that the scale of variables influence the gradient/optimization

I've the problem that, using something related to Fisher-scoring, the gradient, which is usually the sum over a variable times a value which depends upon the parameter we are looking for, the updates ...
3
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1answer
38 views

How to scale new observations for making predictions when the model was fitted with scaled data?

I understand the concept of scaling the data matrix to use in a linear regression model. For example, in R you could use: ...
0
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0answers
30 views

Question on scaling data

I have been reading Elements of Statistical Learning. And I saw some example R codes written online. I realise that very often the explanatory variables $X$ (the data of the predictors) are ...
0
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0answers
34 views

What is the level of measurement for years?

The years I won the gold medal in Olympics 1990/1991 1995/1996 1998/1999 I understand that quantitative data can be used on numeric scale. Perhaps, this can. Also I believe this is a ratio data ...
0
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2answers
54 views

Basic information about partial correlation

I'm quite new to this topic, so this is probably very basic for most of you: I want to analyse the relationship of multiple variables via partial correlation as an alternative for a regression ...
1
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1answer
43 views

How to rank criteria based on survey response?

I have made a survey to weight the importance of different features of a credit card using a 5 point Likert scale with scores (very important = 5...neither important or unimportant = 1). I have 8 ...
1
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1answer
39 views

Comparing correlations of variables with different scales

Probably a stupid question, but: I have a couple of variables with different scales - I don't want to use contingency tables so Is there a way to calculate all the correlations with different methods ...
4
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4answers
148 views

If a measure is valid (but not necesarily reliable), can it be consistently replicated?

I had this question on an exam, and I was positive that the answer was A. The Beck Depression Inventory is a scale intended to measure depression levels, with higher scores indicative of higher ...
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0answers
13 views

Using BTL2 : Can we fix the scale of the ability-scores?

Using the Bradley Terry Luce 2 model: We want to rank 41 scripts by paired-comparison (package BTL2). But our dataset is incomplete. We can generate ability scores, but the scores at the end of the ...
1
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0answers
57 views

Different Likert scales used in statistical anlysis [duplicate]

I am using different Likert Scales in questionnaire. Three dependent variables have Likert scales of 4 points, 2 points and 2 points. Three independent variables have 3 points scales. One moderating ...
5
votes
1answer
111 views

Advice/literature on combining items with different response scales into composite scales?

Let's say I have some self-report items measured on a 5-point Likert scale (Strongly Disagree to Strongly Agree) and other items measured on a 4-point Likert scale (Never, Rarely, Sometimes, Often). ...
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0answers
41 views

How to calculate ratings/rankings from Paired comparison / Pairwise comparison of large data-sets?

As part of my graduate thesis (area: psychology) I have gathered preference data. The data includes approximately 50000 heads-up comparison between elementX and elementX. I have a total of 15 ...
1
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1answer
54 views

Why multiplication and division are not allowed when using the interval scale?

This is what I already know: There is no true zero value on interval scales like temperature. The zero value doesn't state that temperature becomes unavailable at that point. Zero is just a human ...
2
votes
1answer
51 views

Validation of a questionnaire in a new population

I have 400 responses to a 20 item questionnaire which purports to measure an attitudinal constuct in medical students. The instrument was validated in the US for a single year of medical students and ...
1
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1answer
111 views

CFA Fit Measure Thresholds for New Scales

A well established questionnaire measuring interpersonal relations is modified to measure interorganizational relations. 11 parameters of the relation are determined by 4 items each. Items are removed ...
0
votes
1answer
71 views

Calculating total score for a scale including polytomous and dichotomous items [duplicate]

I have a variable that is measured using a 13-item, 4-point Likert scale with the exception of one item (yes $=1$, no $=2)$. How can I calculate the total score for this variable?
2
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0answers
34 views

Is there any “standards” for minimum variance of likert-type measured variables?

I want to develop a questionnaire. Because the target population are children, I used 3-point likert-type scale (0 1 2) for my items. Now I want to remove invariant items (i.e. the items not having ...
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2answers
491 views

What is the difference among Indicator, Index, Variable and Measure?

What is exactly the difference among Indicator, Index, Variable and Measure? I would appreciate some reference.
1
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0answers
25 views

What is the statistical efficiency of L-moments?

In particular I am interested in the scale estimator. Hopefully it is much better than that of IQR.
4
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3answers
141 views

How to check psychometric type of scales?

It is well known, that there are diffrent types of scales (see Wikipedia Level of measurement). In psycholinguistics there is Semantic Differential technique. It uses a scale (usually 5 or 7 grades) ...
4
votes
1answer
251 views

Whether to test items for normality (and transform) when performing confirmatory factor analysis on a set of scales?

I received the following email: My project involves rewording a questionnaire and seeing if the internal reliability and CFA results improve. There are 30 items that are meant to form 4 subscales. ...
5
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0answers
167 views

Which normalization method for different units (zero, negative, etc.)

Commonly, normalization of ratings seems to mean adjusting values measured on different scales to a notionally common scale. I have different metrics that measure different performance aspects of a ...
0
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0answers
57 views

Is there something like an absolute scale type?

Some measures seem to be of a different type to others, depending on what kind of statements are meaningful. Different scale types try to capture that difference. Known interval scale types are: ...
0
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1answer
48 views

Determining the scale type

I have different functions, that measure characteristics like completeness or reputation. I try to find out on what scale types they are (nominal, ordinal, interval, ratio or absolute). Most of the ...
2
votes
1answer
37 views

In order to increase variance, can I get my items classified twice by each participant?

I have a set of items (10 per domain: 5 domains in total) that participants need to classify according to a 5-way forced choice scale and that I want to use to generate accuracy scores for ...
0
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2answers
517 views

Combining several Likert items from a Likert scale into one variable [duplicate]

Hi there I have a very important question for my statistical analysis which needs to be finished in a few days. First of all I have to say that I have not much knowledge of statistics and therefore ...
3
votes
1answer
189 views

What is the correct use of Cronbach's alpha?

I am trying to use Cronbach's alpha in order to see if some variables are measuring the "same", but I have some doubts about the correct use: Can I compute alpha for numerical, ordinal or ...
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0answers
89 views

Confirmatory factor analysis for a newly constructed questionnaire

I am about to develop a new questionnaire with 142 questions I have performed exploratory factor analysis and 30 latent factors were extracted. I was wondering if it is necessary to perform ...
1
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0answers
23 views

how to compare partial ratings of a set of data by different groups of participants?

So lets say I have N items and I want to rate their relevance (say on a 5-point likert scale: 1 being least and 5 being most relevant) to the "perception of beauty" and I have M number of ...
1
vote
1answer
27 views

Can I split my data into several groups to be rated by various participants?

I am conducting a study on a pool of data which consisted of 200 items. I am planning to use rating scales to see how these items relate to a concept (e.g. "how are the next items related to the ...
2
votes
1answer
91 views

Determining which scale items to use for further analysis

From a questionnaire survey I have 44 statements (items) which were supposed to measure 11 bases of power (factors). Four items per factor. Since this survey was only slightly altered from its well ...
3
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0answers
144 views

What factor loading is recommended to retaining items in a factor analysis?

I received the following question via email and thought it would be suited to this site: I have a debate with a friend about factor loading and squared multiple correlation. ... In my debate ...
0
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0answers
18 views

Scale values and variance analysis

Having built a scale with 7 items in SPSS I calculated the mean of the answer scores (summed the answers and divided by the number of items). Now I want to calculate a regression analysis. Is this ...
1
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0answers
31 views

Whether to include individual items or the composite variable in structural equational modelling?

I made performing structural equation modelling. Some of my latent variables include a lot of items (e.g., 20 or more items). Alternatively, I could just include in the model a composite variable ...
4
votes
1answer
105 views

How to choose the scaling matrix in ABC (without cheating!)?

I am doing a numerical experiment involving comparing Approximate Bayesian Computation (ABC) with other methods. I am simulating data $\boldsymbol{y}$ from a model and I'm using ABC to get a sample ...
3
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0answers
89 views

Should I run measurement invariance if confirmatory factor analysis is not affirmative?

I have a repeated measures design for a Likert scale with 10 items. This scale is assumed to be unidimensional and this is one of the research questions along with the scales measurement invariance ...
0
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0answers
124 views

Measurement bias with Likert items and dichotomous items

I'm hoping someone here might be able to answer a question I am struggling with. I'm trying to find the best way to test differences across and within 3 conditions, where I am manipulating my ...
3
votes
1answer
108 views

Summing up ordered items to a sum-score: implications?

It is common practice in psychology to add together ordered items to sum-scores, and then use these sum-scores for subsequent statistics. This is usually done without explicitly mentioning measurement ...
1
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1answer
88 views

Showing that an apparent continuous variable is actually a 2-level categorical variable

I have some survey data and employees are divided into grades (from 1 to 7). At first glance, this appears to be a continuous variable. However, based on my knowledge of the organization, I know that ...
2
votes
1answer
417 views

Items from two constructs load on one factor in factor analysis

I am trying to determine the factor structure of a set of 84 items. Exploratory factor analysis using varimax rotation was conducted to estimate the underlying factor structure for the sample data. ...
0
votes
2answers
102 views

Unexpected factor structure in different samples

I have administered a questionnaire to respondents asking about customers' adoption of technology. I want to do an exploratory principal components factor analysis in Stata to form constructs from a ...
1
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2answers
107 views

Technical term for a survey scale with opposite values at both ends?

I am having trouble finding the technical term for a scale used in survey research with opposite values at both ends of the scale. For instance, how can I refer to a scale of the following kind: In ...
1
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0answers
427 views

PCA on log transformed data

I am about to conduct two Principal Component Analyses (PCA) on species abundance data and species composition data. I have about 12 different locations where abundance data for over 50 invertebrate ...
0
votes
1answer
212 views

Correct Analysis of Likert score (Product of two Likert scales)?

I have two Likert scale questions measuring perception of risk (Severity & Probability). For example: What kind of injury is caused by falling from a height of ten feet? no injuries slight ...
1
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0answers
313 views

Ordinal data, different scales, comparison between variables

I would appreciate any help you could give me I have ordinal data which I want to standardise in order to compare averages and data spread between variables. I need to standardise since the variables ...
2
votes
3answers
361 views

Where should N/A be placed and how should it be coded on a 7-point Likert scale?

Background: I'd like to use a 7-point Likert scale for an upcoming survey (focused primarily on opinions). For the most part, the questions will be centered around the "To what extent...?" stem. ...
3
votes
1answer
131 views

Validation of a scale for a different population (CFA)

I'm currently adapting a coping questionnaire which has been widely used in sports to be used with a different population (musicians), so I need to address its reliability and validity with this new ...
4
votes
1answer
2k views

4 point and 5 point Likert scales in a new questionnaire

I'm looking to confirm whether having a 4 point Likert Scale for some constructs, and a 5 point Likert scale for other constructs will be suitable when developing a questionnaire? I have 7 constructs ...
2
votes
1answer
130 views

Usage of PCA - how to scale observations? [duplicate]

I want to use PCA in this kind of situation. I have three variables: how many times something happened for user - positive integer; total "power" of all happened events for user - real number, can ...