Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [analysis-of-means]

15 questions
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T-test, ANOVA or Regression, what's the difference?

I know this question has been asked in similar ways already, but cannot find a suitable answer to understand it. I have three subsamples defined on programme participation (participants, drop-out, and comparison) and want to test for each of the…
Papayapap
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Equicorrelation of deviations from a grand mean

In the following article: Nelson, L. S. "EXACT CRITICAL-VALUES FOR USE WITH THE ANALYSIS OF MEANS." Journal of Quality Technology 15.1 (1983): 40-44. Nelson states that "When ANOM [Analysis of Means] is applied to k means based on equal sample…
Todd Johnson
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Comparing between normally distributed means

Analyzing the difference between the means of two independent unbiased samples obtained from normally distributed variables with homogenous variances: Two possible approaches: Perform a 2-sample t-test (H0: Mean1-Mean2=0) Calculate the 95% C.I of…
Alex
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How to compare means among groups with a single value?

My aim is to compare means among different groups, but I only have one single value (mean) for each group. I also have the total number of individuals per group. I don't have data for all individuals inside the group as I am comparing results from…
LauraMon
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What Statistical Test should I use to compare count data using two grouping variables?

My data represents the count of mutations by gene in two groups cases and ctrl. I would like to do comparison gene-wise between the two groups. But in my case I don’t think anova is appropriate since count data follows a Poisson distribution. Here a…
Salvatore Di Giorgio
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Comparing means--some scores within, some across groups

I have a pool of scores. In my design, two groups of subjects complete either experimental task A and a control task, or experimental task B and a control task (the same kind of control task as other group). So, Group 1 gets A and C; Group 2 gets B…
n0054
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Is there some good references of the method Median of Means Estimator?

I can't find the term in Wikipedia, and by searching online, I seem to know the original material raised up the idea Median of Means Estimator is this book, while I can only find the scanned edition of this book, so I can't directly search the…
narip
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How do I test for significant differences given only means and standard error?

I'm in a situation where I have two (equally long) lists of means, with sample sizes and stderr for each mean. The variance for these means are all variable and different, and so are the sample sizes. Here's an example of 3 random positions: x1: …
Absolome
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How to tell if difference in f-score is significant?

I have $N$ data points, each of which has an associated label that is either $0$ or $1$. For which data point I know the true label. Say I put all true labels in a vector $t$. Next I ask Alice to label each data point (without access to the true…
hyperio
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Calculating if there's a significant difference between the difference of two sets of groups

I measured the speeds snails fell off in a high-speed aquarium, where current was created by me opening a valve to different degrees, leading to the speeds that snails could fall-off at being set and not continuous. The snails were off two…
LittleSparrow
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Comparing two means from one person at one time date

A short shot of help would be great!! Thanks a lot in advance. I have asked same probands to rate two groups of people, e.g. unemployed indivduals versus employed individuals with parallel formulated items, e.g. How motivated are unemployed people?…
Jens
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Compare multiple means and finding which one is the biggest and which one is the smallest

Is there a statistical test I can apply to compare multiple rates and get which one is the biggest and which one is the smallest? Example: 1 person converted out of 2 for page A. conversion 1/2 10 person converted out of 1000 for page B. conversion…
Nessim Btesh
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Best test to use for investigating if the difference between means is significant?

I'm studying the length of stay for patients in a hospital. I have a sample of n=4533 observations. Each of these observations are assigned to an admin group numbered between 1 and 8, based on the reason they were admitted to hospital. Admin group 2…
rainingagain
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Which test does the lsmeans package use to compare the means in pairwise tests and what are its assumptions?

I'm currently using lsmeans to compare the means of various groups using the contrast argument. I'm using data that follows a Gaussian distribution. Would an unbalanced data structure affect the rate of type I errors or inflate them?
ziab_m
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Proper statistical analysis to compare means from three groups with two treatment each

any help to solve this is greatly appreciated: The research question is to assess the superiority of Treatment A for estimulate bone growth in comparison with Treatment B, the current standard. I'm planning to compare two treatments to estimulate…
sergiouribe
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