The interval tag has no wiki summary.
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1answer
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Burns survival dataset - meaning of midpoint of set interval
I'm using the well-known USC Burns Survival dataset to explore logistic regression in R.
The independent variable is burn area, and the outcome is binary survival (yes/no).
In the documentation, ...
3
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2answers
60 views
Spearman Rho or ANOVA when examining effect of ordinal IV on continuous DV?
I have an ordinal independent variable (<1hr, 1hr, 1-3hrs, 3-5hrs, >5hrs) and an interval dependent variable (test scores). Apparently I am expected to examine the relationship between the two by ...
7
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1answer
115 views
MLE/Likelihood of lognormally distributed interval
I have a variable set of responses that are expressed as an interval such as the sample below.
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0answers
29 views
Some clear range and interval definitions
What is your or an offical (please provide link to citation) definition of range AND interval _?
Or perhaps put in another way: what is the major important difference between the two terms _?
In my ...
1
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1answer
28 views
generate an exact pivotal quantity for theta
Given a random sample $x_1,...,x_n$ from $f(x|\theta)=\frac{\theta}{(x+1)^{\theta+1}}$, $x\ge0$
How to generate an exact pivotal quantity for $\theta$?
3
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1answer
43 views
How to analyse Self-Assessment Manikin data
I am trying to analyse data collected through the Self-Assessment Manikin (SAM), which uses three pictorial scales to assess the three dimensions of pleasure, arousal and dominance. Participants are ...
2
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2answers
120 views
What do you call a measurement that's halfway between ordinal and interval?
Suppose you have a measurement $Y_i$. Now suppose that the differences between two measurements $\delta_{ij}=Y_i-Y_j$ are an ordinal measurement. From my understanding, $Y_i$ is more informative ...
2
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0answers
131 views
Confidence Interval for a Percent Change
Good Morning,
A mentor has asked me to calculate the 95% confidence interval surrounding a percent change.
To help frame the question, I have calculated the incidence of a disease within the ...
36
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5answers
2k views
Are all values within a 95% confidence interval equally likely?
I have found discordant information on the question: "If one constructs a 95% confidence interval (CI) of a difference in means or a difference in proportions, are all values within the CI equally ...
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3answers
977 views
Which tests can I use to analyze dependent likert-type data?
In a survey, where students were presented various stimuli, after each stimulus they were asked to rate the following:
Quality, on a five-point scale from "Excellent" to "Bad", let's say $Q$
...
-1
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1answer
163 views
Is data on a 1 to 4 scale interval or ordinal?
I have data on 26 participants (13 from computing and remaining 13 from non computing) who have participated in my research. Each participant is treated with a lab module (Hands on Robotics Session). ...
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1answer
144 views
Confidence interval for Poisson parameter
To calculate an upper confidence limit on a Poisson parameter, a $\chi^2$ distribution with probability $P$ and $${\rm degrees \ of \ freedom} = 2X + 2$$ can be used (Nelson, 1982. Applied Life Data ...
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2answers
149 views
Interval estimation of $\sigma^2$ with the reliability of $95\%$
I got these values from the measurement by a telescope:
20.1, 20.2, 19.9, 20, 20.5, 20.5, 20, 19.8, 19.9, 20.
I know that the actual distance is 20 km and the error of the measurement is not affected ...
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2answers
3k views
How to transform ordinal data from questionnaire into proper interval data?
Are there any straightforward methods of transforming ordinal level data into interval level (just as there are for doing it the other way round)? And performable in Excel or SPSS?
Having the data, ...
0
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1answer
763 views
Is a 1-sided 90% prediction interval equivalent to a 2-sided 95% prediction interval?
I have located references that indicate that a 1-sided confidence band is equivalent to the 95% 2-sided confidence band on a linear regression. Does this equivalence hold true for prediction ...
1
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2answers
151 views
How to dynamically calculate interval designations of data?
I am looking for an equation to calculate appropriate intervals to designate values as very low, low, medium, high, very high for dynamic data.
for example if my dataset ranges from 0 to 100 very ...
13
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5answers
3k views
Group differences on a five point Likert item
Following on from this question:
Imagine that you want to test for differences in central tendency between two groups (e.g., males and females)
on a 5-point Likert item (e.g., satisfaction with life: ...
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4answers
12k views
Under what conditions should Likert scales be used as ordinal or interval data?
Many studies in the social sciences use Likert scales. When is it appropriate to use Likert data as ordinal and when is it appropriate to use it as interval data?
