All Questions
Tagged with nonparametric mean
25
questions
5
votes
3
answers
133
views
Non-parametric one-sample mean test for a bounded variable (based on Chebyshev's inequality?)
The problem
I have $x_1, \ldots , x_n$ i.i.d. draws from r.v. $X$ such that $0 \leq X \leq 1$, but I can't make any other assumptions about the distribution.
I want to test the null hypothesis that $E(...
- 2,637
0
votes
0
answers
65
views
Comparing averages of non normal distributions
I want to compare the daily average revenue of a promotion period (7 days) of a business with the daily average of the rest of the year.
So, sample 1 has 7 data points, whereas sample 2 has 300 data ...
- 1
3
votes
1
answer
2k
views
Can non-parametric data have mean value and standard deviation?
I understand that for non-parametric data, the probability density function (pdf) cannot be obtained using parameters like (mean value) and (standard deviation), and I understand that we use Kernel ...
- 143
2
votes
1
answer
269
views
Problem in finding a non-parametric confidence interval for median and mean using Frank Harrell approach when we have more than two categories
These days I am looking for a good estimation for the mean and median difference confidence interval when I have categorical variables with more than two levels using the Kruskal test, Here Dr. Frank ...
- 31
1
vote
0
answers
78
views
Nonparametric confidence interval for the mean: Failure to reproduce formula from Zhou & Dinh (2005)
Zhou & Dinh (2005) propose the following formula for a $(1 - \alpha)100\%$ confidence interval for the mean of one sample. The confidence interval is based on a transformation of the
$t$-statistic:...
- 31k
1
vote
2
answers
4k
views
Should I use 'median' instead of 'mean' for nonparametric distributions?
I have a dataset that I determined was nonparametric. If I want to do calculations like '% change', and find the average percentage change, should I really find the median percentage change instead of ...
- 31
0
votes
1
answer
129
views
How to find if the means of multiple groups are significantly different when the data is of non-normal distribution: Kruskal-Wallis?
I have dive data from ten shark tags. The tags recorded depth every 10 seconds while at liberty and returned a combined total of >900 k depth records. I would like to see if there is a significant ...
- 113
3
votes
1
answer
2k
views
Test to show one distribution is bigger than another
Here is a MWE of my problem:
I measure the size, $S$, of 10 red apples and 32 green apples.
$\bar S_\mathrm{red} = 8 \pm 1\,\mathrm{cm}$ and $\bar S_\mathrm{green} = 4 \pm 2\,\mathrm{cm}$.
I want ...
- 55
1
vote
1
answer
216
views
Variance in a T-test using means/medians
I have turning data for animals in different conditions with comparisons of before and after these conditions, we'll say condA condB.
Each animal has 3 repeats on both conditions, where before a ...
- 127
1
vote
0
answers
36
views
2 sample t test
I was thinking that a simple 2 sample t test is not that simple when dealing with skewed data.
Considere 2 samples, each one with diferent skewness and kurtosis, both with a big sample sizes (say n > ...
- 561
3
votes
1
answer
664
views
How to estimate the confidence interval of the difference of means?
I have two sets of measurements (repeated measurements of two processes, let's call them $X=\{X_i\}_{0...n}$ and $Y=\{Y_i\}_{0...m}$), and I would like to estimate (with confidence interval) the ...
1
vote
0
answers
25
views
Can one use parametric regression tests (e.g., Pearson's R2) on summary statistics (that are normal) derived from non-normal data?
Can one use parametric linear regression tests (e.g., Pearson's R2) on summary statistics (e.g., mean and median) that are normal but derived from non-normal data?
I am specifically dealing with mean ...
- 11
0
votes
0
answers
43
views
Coefficient of variation for nonparametric data [duplicate]
Is it appropriate to use the coefficient of variation (CV) for non-parametric data?
I'm not sure whether it is appropriate since you use the mean of the data to calculate it together with the SD. ...
- 1
0
votes
0
answers
1k
views
Non-parametric mean comparison with 2 unequal samples?
As an spanish speaker, I apologize if my technical english isn't 100% accurate. This may be a simple question, but I haven't found a clear answer.
I have two independent groups: Group A: n=1520 / ...
- 135
1
vote
0
answers
104
views
Can these ordinal variables be aggregated?
I have an ordinal dependent measure that has been taken over 12 time points at the same 180 locations on each occasion. It consists of a 4-point ant density rating that relates to specific numbers of ...
- 11