The confidence tag has no wiki summary.
-1
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0answers
27 views
Method to evaluate a multiple choice type survey [closed]
I have designed a survey that asks survey takes a set of question based on a video. There are many such videos and each video has three questions. Questions have four options each. I need to evaluate ...
0
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0answers
27 views
Looking for feedback on generating confidence bands around fixed effects
I am using a mixed effects model in nlme. This generates a curve based on a function of the form a * (exp(-b * x)). I would like to generate confidence bands around the mean curve for the fixed ...
0
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0answers
29 views
Confidence Bands in non linear mixed effects models
Is there a way to get confidence bands around the fitted population fixed effects curve for non linear mixed effects models fitted in nlme? I would like to plot the population mean fitted curve with ...
1
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3answers
78 views
Need help understanding calculation about Confidence interval
I am currently reading Math behind A/B testing written by Amazon and got stuck. At some point they say:
To determine the 95% confidence interval on each side of conversion
rate, we multiply the ...
0
votes
2answers
22 views
Normalized confidence measure of point from normal distribution
I have a 1D normal distribution with mean $\mu$ and standard deviation $\sigma$. Given a new number $x$, I want to assign a confidence value to how likely $x$ is to have been drawn from the ...
1
vote
1answer
27 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 $\theta$?
1
vote
1answer
59 views
SVM confidence according to distance from hyperline
For a probabilistic multi-class classifier we can get probabilities of membership of a new point $x$ to each class $y_i$; in case of 3 classes suppose that we get $P(y_a|x) > P(y_b|x) > ...
5
votes
1answer
86 views
Can one compute confidence intervals for a census with high nonresponse rates?
If a questionnaire was administered to an entire population (group of interest) and the response rate was 68% can the questionnaire results be generalized to the population (100%, including the 32% ...
3
votes
1answer
61 views
Comparing MLE parameters using bootstrapped confidence intervals
I have MLE curve parameter estimates for 3 populations (2 per population), and am looking for a clever way to compare them.
At the moment, I am non-parametrically bootstrapping my datasets in order to ...
0
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0answers
71 views
Minimum sample size
Probably a basic question, but here goes:
Suppose we have 1000 people who respond to a survey (500 men, 500 women)
Respondents can choose to "like" a series of pages.
Each respondent can "like" as ...
3
votes
0answers
60 views
Calculate confidence/chance of beating baseline
As shown in the Google Web Optimizer example I would like to calculate the chance of beating baseline (original) - I tried around but couldn't figure out how they do it. I think the +- next to the ...
2
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0answers
96 views
Measuring real advertising effect: control group issue
Background:
The goal is to measure impact of advertising technique - retargeting. Retargeting is about showing related ads to prospects who add something to shopping cart but abandon it. We would be ...
9
votes
1answer
169 views
Voting system that uses confidence for each voter
Let's say, we have simple "yes/no" question that we want to know answer to. And there are N people "voting" for correct answer. Every voter has a history - list of 1's and 0's, showing whether they ...
2
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0answers
127 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 ...
4
votes
1answer
158 views
t-distribution confidence intervals for non-Gaussian data but large n
I have a question concerning a claim I read in statistics books concerning the applicability of the t-distribution to compute confidence intervals for large $n$ if the data is not normally distributed ...
3
votes
2answers
250 views
Confidence intervals for exponential smoothing
I'm using exponential smoothing (Brown's method) for forecasting. The forecast can be calculated for one or more steps (time intervals). Is there any way to calculate confidence intervals for such ...
2
votes
1answer
134 views
Bootstrap confidence intervals for partitioned variances in R
I'm trying to determine the variance partitioning within plant drought tolerance data among hierarchical ecological levels, from species to forest sites to biome levels. I did that with the varcomp ...
2
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2answers
65 views
Algebra for data confidence
Very often, we use data which are derived from some measurements. These measurements usually have a confidence measure associated which tells how reliable or confident we are about the measure. For ...
1
vote
1answer
44 views
If my counts are from a proportion (resampling) of a sample, does it influence the confidence interval?
The aim is to estimate the proportion (or counts) of a certain species among a collected sample. Due to the large number, it is not possible to count through the whole sample. So I have to select a ...
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 ...
