# confidence interval

1. ### Funnel Plot - not based on rate, %, expected v actual count.

Hi, I have been tasked with producing some funnel plots that are somewhat different to the ones i am used to producing. Normally i would be plotting something along the lines of: X-axis: Number of discharges Y-axis: rate of re-admissions. However, this time i have been asked to produce...
2. ### Sensitivity/Specificity: determining confidence intervals for a small sample size

I'm conducting a study to determine the validity of a diagnostic test, by comparing its results to a reference standard. The variables I'm dealing with are all categorical. Sadly, I couldn't obtain a proper sample size since the prevalence of the disease is very low (about 6%). When I...
3. ### Having a problem with confidence intervals

Here is the data, each line is for a different soccer franchise: Revenue/Value(Millions) 459/1835 563/323 369/1181 513/1000 406/990 304/822 276/800 285/656 340/646 276/413 175/384 186/372 196/333 206/329 205/308 161/274 187/262 145/261 143/258 142/198...
4. ### Help with ANOVA Analysis of Data

I need to compute: The sum of squares associated with sex from the ANOVA table; Create histograms of the data used in the ANOVA for each level of Sex independently. Using this output and boxplot and apply do you think the assumptions of ANOVA have been met? How do I input the data of...
5. ### Confidence intervals vs. p -value

Hi, we just had a very interesting discussion about the role of confidence intervals and p values in determining significance and I realised there is a point that is quite unclear to me, so, here is the question: I am considering a simple situation, a two sample proportion test, say. For each...
6. ### Constructing a Nonparametric confidence interval

The following data consist of six TcCB measurements from a particular site: 0.26 1.84 0.78 1.59 0.84 1.53 Use the table below to construct the shortest possible non parametric confidence interval for x 0.25 (25th percentile) assuming that the confidence level must be at least 80%. So, I...
7. ### Confused with meta-analysis (Hedges); credibility intervals

Dear All, Many thanks in advance for reading this - any help is gratefully received! I'm trying to combine the incidence rates for a complication of surgery (a ratio that i'm using as r). I am using the Hedges method Random Effects Model (as i have hetrogeneity in my studies). I want to...
8. ### 95% confidence interval for the difference in true proportions for Chi-squared test

Hello, Apologies if this has been covered, but if so I couldn't find it. Can anyone please tell me how to calculate the 95% confidence interval for the difference in true proportions for Chi-squared test (not for the Odds Ratio). I can work it out manually (I know it should be 0.082 to...
9. ### Estimating Confidence Intevals

Hi, I have used a loglikelihood function to estimate 24 parameters. How do I construct a confidence interval given the Hessian (avaliated on the estimatives) and the gradiente(avaliated on the estimatives). Do I need both? What I saw is that, given that MLE is assymptoticaly normal I...

20. ### CI for difference between means

Control: n=13, Mean=32.77, StDev=32.77, SEMean=3.328 Treatment: n=16, Mean=42.01, StDev=17.2, SEMean=4.3 Point Estimate for treatment - control = 9.24 df = 27 What is the 98% CI? I calculated the ME as 13.45 and the CI as (-4.21, 22.69) Is this correct?