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11 views

Getting percentage range of variance accounted for by DV in confidence interval

I have a confidence interval that has a range of values. How can I turn those values into a percentage range that represents the possible variance accounted for by the DV? ...
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21 views

Confidence Intervals

I have a question as I am struggling with understanding Confidence intervals. Does the width of a confidence interval get smaller as the confidence level gets larger.
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0answers
33 views

How to calculate the required sample size for x% accuracy?

I've made an algorithm for parsing some strings, and the question I have is how many random strings should I collect and test to get an estimate of how good the algorithm is? Testing on all is not ...
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0answers
23 views

Forecasting bank account balance data

I'm new to statistics and not even entirely sure how to frame my question properly, so please go easy with me. I would like to be able to do 2 things: Take a series of dates and bank account ...
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0answers
12 views

Resource allocation for many logistic models

This question is kind of vague but I will do my best to articulate it as best I can. I have many logistic regression models that are modeling polls of many different types of questions. All of the ...
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0answers
18 views

Gender package confidence factor in R

R's gender package is a great library to determine gender from first names. I know that the package predicts the gender by calculating the proportion of male and female names given a range of years. ...
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0answers
16 views

Are there any circumstances under which a confidence interval can be interpreted as a likelihood interval? What are they?

I read the answers provided to the question "are all values in a 95% confidence interval equally likely?". These answers raise questions for me regarding interpretation. I have read that under ...
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0answers
11 views

Two sided confidence intervals and statistical significance

Can the confidence interval include 0 and be statistically significant if it is a two sided confidence interval?
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0answers
20 views

Making a table of probabilities

I apologize if this is the wrong board - I couldn't think of somewhere better to put it. I am making a table, going from higher certainty to lower certainty. It represents the probability that two ...
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0answers
18 views

Confidence region for arbitrary multivariate distribution

I wonder if there are any publications on computing confidence region for arbitrary multivariate distribution. So far, I found the following approach: compute confidence interval coordinate vise and ...
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1answer
42 views

Largest or smallest confidence interval at $\pi_{i}=0.5$ in logistic regression

A binomial GLM can be written as: $Y_{i}\thicksim B(1,\pi_{i})$ $\mathrm{E}(Y_{i})=\pi_{i}$ and $\mathrm{var}(Y_{i})=\pi_{i}\times(1-\pi_{i})$ ...
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1answer
16 views

Criteria for wide Confidence interval

Is there a criteria to say a statistical confidence interval is wide or narrow? Is there any formula to know?
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0answers
8 views

How can I get a confidence interval for p from a small cluster sample?

I have small cluster sample (n=4, N=75) where all elements in each cluster are sampled. I'm using a ratio estimate to estimate p, the proportion of successes. If I can't use the normal approximation ...
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0answers
30 views

User Study Setup: Correct selection of tasks

I'm struggling with the problem to design a formally correct user study. I have the following circumstances: I want users to assess the (subjective) usefulness of a -so called- trail result. That ...
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0answers
49 views

How to indicate a 95% confidence interval for the total amount to be paid

Can you please help me to solve this question! Peter who is soon to be married, has for a long time been thinking about the perfect morning gift for his bride, Kate. As the couple is going to run a ...
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2answers
165 views

Why is it so uncommon to report confidence intervals for medians?

Why is it so uncommon to find confidence intervals reported in papers from applied sciences? I work mostly on Computer Science, but often read papers from (Social) Psychology, Sociology and Urban ...
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1answer
45 views

Confidence measures for Gaussian mixture models

When generating Gaussian mixture models using expectation maximization with Bayesian Information Criterion, is it necessary to report a confidence measure? How do you know that the algorithms are ...
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0answers
33 views

What would be null and alternate hypothesis

A photoconductor film is manufactured at a nominal thickness of 25 mils. The product engineer wishes to increase the mean speed of the film and believes that this can be achieved by reducing the ...
1
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1answer
33 views

appropriate binomial proportion confidence interval for repeated measures

So I have looked this up extensively and keep getting the same answer, but its because what I can find online isn't quite to the point. I want to put a confidence interval on a binomial proportion, ...
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0answers
17 views

How many random voting machines must be validated to be certain they are not biased? [closed]

In Brazil often people question the results given by the electronic voting system. At the end of the elections, each voting machine prints a bill containing the votes it computed, and that same data ...
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0answers
21 views

How to identify noise due to discretization

The problem: I'm looking at data which was measured both with respect to time and (vertical) space domain. What I want to do is first obtain the wavenumber-spectrum (more specifically shear, since ...
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0answers
13 views

How can the Lift measure be interpreted?

If we have items A and B appearing together and separately and the support, confidence and lift as follows, can we say that: "persons having A will be 1.25 times more likely to have also B than the ...
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1answer
210 views

How to determine if a weighted average is accurate?

I have the following problem. Consider that there is an election where n persons are voting. The goal of the election is to estimate the weight of a bag. Each person can vote for an integer value : ...
3
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1answer
29 views

Confidence intervals from pivotal quantities

I am reading a book somewhere it introduces pivot as a way of constructing a confidence interval for a parameter. My question is: it says $q_{0.025} < = \lambda n \bar{X} <= q_{0.975} $ is a ...
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0answers
23 views

confidence interval comparision to likelihood function

I have question, it is taken from a book. It says: Let $X_1 , X_2$ denote a random sample of size n = 2 from a continuous uniform distribution $U(\theta - 0.5, \theta + 0.5)$ with unknown parameter ...
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0answers
11 views

Confidence interpretation from false negative rate

For my research I'm using a tool called seeSUMO, which predicts sumoylation sites in a protein based on sequence features. When it reports your results, it gives you a level of confidence for each ...
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0answers
54 views

Sample size for tracking data

I'm currently trying to figure out how to estimate a fitting sample size for a specific problem. The situation is as follows: We've got x people, of whom we are able to track y% - all the time, so we ...
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0answers
28 views

How to determine certainty on a range of probabilites and overall accuracy?

I'm trying to determine if the prediction made by my classifier is certain enough. Known: The probabilities for each possible class, for example: ...
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0answers
15 views

How can we compare two probabilistic models(markov networks) such that its prediction(confidence) depends on amount of training data?

I have a task of comparing two CRF models where each node and edge probability is associated with reliability depending on amount of data it is trained .How can I have a confidence metric for ...
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0answers
202 views

Confidence Interval calculation for Power Density Estimation in MATLAB

First of all, I am new to these statistics stuff but very interested in the background. I try to understand the confidence interval calculation for a power spectral density estimate in MATLAB. For the ...
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0answers
80 views

Scoring model/formula to rank based on accuracy of data sources

Let us say i have 5 different data sources. My aim is arrive a score to arrive the accuracy of this data sources. It is like below 1. Refer the section Data confidence calculation in ...
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0answers
42 views

AB test - Is it okay to use a result with a low confidence level

Suppose you conduct an A/B test of 10,000 views for each of version A and B, but the results take 3 months to capture. Despite a small number of views, achieving a goal (converting a "view" to a ...
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3answers
2k views

How to choose a confidence level?

I often use a 90% confidence level, accepting that this has a greater degree of uncertainty than 95% or 99%. But are there any guidelines on how to choose the right confidence level? Or guidelines ...
0
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1answer
12 views

Difference in confidence intervals of two sample sizes given a finite population

I can't seem to wrap my head around this problem. My company is commissioning a facility that recovers two types of metal from ash generated from an incinerator: ferrous (metal containing iron) and ...
2
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1answer
121 views

Confidence interval for polynomial linear regression

I have a model which is not linear but rather polynomial, and I have to estimate the parameters by giving a 95% confidence interval. There are plenty of formulas for regression of the type $Y = ...
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0answers
24 views

How to decide which of two distributions a sample is from?

I have two random distributions. How can I get a quantitative estimate of the likelyhood that a particular sample was taken from one or the other of the distributions? To be more precise: Let $I = ...
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1answer
57 views

How do I calculate required Sample Size to get useful confidence interval length for Bernoulli random variables?

I am pulling meta data fields from a population of 100M documents. These meta fields include things like Author Name, Author Location, Keywords, etc. Some documents have all of these meta fields, some ...
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0answers
36 views

Combining info from two population coverage levels from a tolerance interval

I have some existing product data from which I've calculated a tolerance interval with a 95% confidence level with at least 95% of population covered. I would like to use this tolerance interval as a ...
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0answers
9 views

we have two separate forest plots with data that we wish to combine into a ratio. We were wondering how this is possible

We have a forest plot of FEV1 values at given NO2 exposure and a second plot of FVC values at given NO2 values. We need to make a forest plot of an FEV1/FVC ratio and do not know how this is possible. ...
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0answers
41 views

Formula for Confidence Interval for effect size

Do anyone have a formula for calculating Confidence Interval for effect size? I need the hand calculation formula for Confidence Interval for effect size (F-Test)?
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0answers
35 views

Upper confidence interval for the variance using chi squared distribution

It is needed how to estimate the upper confidence interval for variance. I have the equations here from a document. I attach a photo of one page. I do have the raw data and hence the mean values, ...
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0answers
43 views

calculate statistical value of the mean of a mean of a mean

EDITED FOR CLARITY Hello, Considering the picture below each values X could be identified by the indeces X_g_s_d_h ...
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0answers
28 views

a/b tests show strange results. Can the results tell if the test method has bugs/issues?

I'm running a/b test on an ecommerce website. The current stats look like this: The problem is that the 'rule' does nothing. so basically the two groups should be identical. The selection of ...
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0answers
28 views

Naive Bayes Produce Confidence

I am pretty newbie in machine learning. Please forgive and point out anyone incorrect use of terminology. Now I am learning Naive Bayes algorithm. As I have learned Neural Network, when predicting, ...
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0answers
50 views

How to test a claim about a confidence interval (real case)

I need to test a claim made by a company stating that 95% of the cases (passangers per day, peak hour) are processed in 40 minutes or less. 1 - I assume I must collect a passanger sample but how ...
0
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1answer
19 views

confidence level in non nested models

I have 7 non nested models: I use the Akaike method to see which one best describes the data. If the models were nested I would use the likelihood ratio test: this woluld also automatically give me ...
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0answers
43 views

How can I estimate (with confidence intervals) the divergence between two smoothing splines?

I have time series data from two independent groups. I want to know whether these groups diverge over time and, if so, when they diverge and for how long. The way I have done this is to estimate ...
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0answers
176 views

Confidence interval and confidence band

How are confidence intervals related to the confidence band (in a nonlinear regression problem)? I understand that the term confidence interval is reserved for the parameters involved in a regression ...
0
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0answers
19 views

multi variate tests - how to find real confidence

We're running multi variate tests on websites. See actual data below. Basically in a session for each banner we randomly choose whether to show/hide it and calculate conversion rates for the show and ...
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0answers
24 views

Fusing probability scores from different independent sources

Consider a situation where two independent sources, $s_1$ and $s_2$ are giving probability estimates regarding the occurrence of a event $e$. I tried to model this as a bayesian network but that ...