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4 views

scale of measurements in sign test and signed rank tesr

Can some one help me to understand the right scale of measurement to use in sign test as well as in signed rank test? I read a certain book it says nominal scale is used in sign test while ordinal ...
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0answers
19 views

Summated scales for factors (latent variables)

For summated scales: can I use all the variables that load on a factor or is it necessary to use only the variables with high loading (over 0.70, for example)?
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1answer
45 views

Eliminated items in Factor Analysis

I'd like to get your opinions on how to interpret items that had to be eliminated in factor analysis (FA). I've been researching consumer shopping motivations and ran a survey with 40 items, which ...
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0answers
27 views

Can one variable explain if another variable is preferred more than others?

I have a questionnaire consisting of 7 multi item scales. The first four multi item scale each represents if a respondent performs a giving role and the remaining 3 multi item scales each represent a ...
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1answer
12 views

Scale of variables and the consequences on the solution

Let us say I have data set of distinct $x_i$. A Gaussian is fitted to it with maximum likelihood, obtaining some $\mu$ and some $\sigma^2$. I will also obtain a likelihood $\mathcal{L}$. Now, I copy ...
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0answers
41 views

How to scale data in a log-lin regression

I am currently doing exam revision, and I am stuck on a question in one of the past exams. It asks us to data scale the following equation: $\ln W$ = 2.54 + 0.4...
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1answer
54 views

Questionnaire design - Agree/Disagree scale

I recently constructed a questionnaire to carry out a market survey on soap brands used. One of the questions which was asked was to rate few statements which influence the respondent to buy a certain ...
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0answers
13 views

How to analyze a variable measured on a Likert scale and its interaction with another variable? [duplicate]

I have to analyze this variable which consists of scores given to 3 items (1-9 scale). This "Likert scale" measures "brand commitment" if thats important. 1) Firstly, should I compute 1 new variable ...
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0answers
22 views

Transforming Rank-Ordered Variable

I am currently working on an archival dataset (General Social Survey 1985). In a measure, participants are asked to rank 5 job characteristics by degree of preference. In other words, participants ...
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0answers
161 views

Transforming scores between different rating scales – Importance of response options

I'm working on a meta analysis of the mean of a single variable (using arithmetic mean as the effect size, rather than the relationship between two variables). The attitude I'm assessing has been ...
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0answers
13 views

Scale of control variable in ANCOVA

I am new to the field of ANCOVAs. I want to check if two groups differ in three quantitative variables. At the same time I would like to control for gender and diagnose (6 categories). Is it ...
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0answers
31 views

Regression analysis of different ranges in percent?

I have two variables, both percentages but have been converted to decimal numbers, and one variable ranges from roughly 15-30 percent and the other ranges from 55-70 percent. The lower range is my ...
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2answers
267 views

What criteria must be met in order to conclude a 'ceiling effect' is occurring?

According to The SAGE Encyclopedia of Social Science Research Methods… [a] ceiling effect occurs when a measure possesses a distinct upper limit for potential responses and a large concentration ...
2
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1answer
37 views

Log-scaled chart for visualizing extreme range

I need a simple bar chart or the like. I am not a statistician by any means, but this chart is supposed to accurately represent FileIO in MB/s compared to the theoretical peak of a specific drive. ...
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1answer
31 views

composite scale to measure child-parent relationship

For my research on Mental health problems and correlates, child-parent relationship have identified as a correlate. Child-parent relationship is planned to measure with 6 questions and each question ...
2
votes
1answer
158 views

Calculating scale mean from item means

I'm working on a review paper and need to collect the means and standard deviations of a given measure (such as a measure of depression) from papers of interest. However, some authors report means and ...
1
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1answer
90 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
115 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
66 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: ...
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0answers
33 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 ...
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0answers
37 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 ...
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2answers
73 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
70 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
123 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 ...
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4answers
318 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
18 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 ...
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0answers
104 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
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1answer
256 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
121 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 ...
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1answer
76 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 ...
3
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1answer
93 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 ...
2
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1answer
198 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 ...
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1answer
119 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
46 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
1k 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.
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0answers
27 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.
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3answers
168 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
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1answer
571 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
239 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 ...
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0answers
77 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
61 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
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1answer
39 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
1k 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
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1answer
312 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
109 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
28 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
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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
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1answer
127 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
222 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 ...
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0answers
39 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 ...