All Questions
Tagged with nonparametric distributions
107
questions
2
votes
1
answer
58
views
Non norma distribution
I have a non-normal distribution (Kilograms ~ Years), so I can't use ANOVA test to reject the null hypothesis (that the tree means are equal).
There is a tendency of weight to be 100kg.
Is there a way ...
- 141
0
votes
1
answer
99
views
Parametric or non parametric test
I want to compare trends of R&D expenditures before and after a crisis. I was planning to use a paired T-test or a non-parametric alternative. But, before of that, I tested the data for normality. ...
user248229
0
votes
0
answers
22
views
Confused about the statistical tests to choose or any transformation to apply
I am new to the stackexchange, so please forgive me for my editing ignorance. I am confused and stuck about how to proceed further with my data. I have the following data
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0
votes
0
answers
149
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Determining differences between curves with the K-S test
I'm running an experiment where my treatments have a significant and highly sensitive effect of the distribution of a result.
For example, if i alter a certain nutrient in a vegetable, the ...
32
votes
3
answers
5k
views
Why does the Kolmogorov-Smirnov test work?
In reading about the 2-sample KS test, I understand exactly what it is doing but I don't understand why it works.
In other words, I can follow all the steps to compute the empirical distribution ...
- 915
1
vote
3
answers
197
views
Confused on normality assumption
I know that the sampling distribution of the mean can be assumed to be normal if N>30, but does this have an implication on the "30" itself (the sample data)?
I have three different time series with ...
- 11
1
vote
0
answers
41
views
Prove the relation between two distribution functions
I have been given a homework in a subject called "Non-Parametric Statistics" and I'm a bit stuck with it. I would be very thankful if you could give me any advice or help, which would lead to a ...
- 49
2
votes
0
answers
150
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Derive probability distributions from i.i.d. Gumbel
I have a question on how to derive (if possible) the following probability distributions.
Consider 3 random variables $(X,Y,Z)$ mutually independent and identically distributed. Specifically, $X$ is ...
- 891
1
vote
0
answers
95
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What among location, scale and shape is Kolmogorov–Smirnov test statistic sensitive to and why? [closed]
I understand that the Kolmogorov–Smirnov test statistic for a given cumulative distribution function $F(x)$ is $D_n = \sup_x |F_n(x) - F(x)|$. However, if I have to rank its sensitivity to location, ...
- 5,643
5
votes
4
answers
2k
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Why use parametric test at all if non parametric tests are 'less strict'
I have read from several sources, even in my undergrad courses, that parametric tests require the data to have a certain distribution, for instance normal, whilst non-parametric don't.
I have ...
- 211
1
vote
0
answers
692
views
Type of parameter of the chi-squared distribution
Chi-squared distribution $\chi^2(k)$ has parameter $k$.
On the one hand, $k$ should be the shape parameter because chi-squared distribution is a special case of Gamma distribution: $\chi^2(k) \equiv ...
- 1,008
0
votes
1
answer
2k
views
Nonparametric test suggestion for distribution comparison
I am not sure if this is appropriate place to ask, but I appreciate any help on this issue. I want to compare the distributions of the results of the two experiments played by the same group of people....
- 119
1
vote
1
answer
1k
views
What if half of your data is not normally distributed? [closed]
My experiment is to test the different diets (Pk, Hg, BYD & Control) in order to check the development of insect, what are the most preferred diets by insect. For this purpose, I used 3 parameters;...
- 11
2
votes
1
answer
738
views
Possible explanations for Imputation before train-test split?
I'm working on a real world data set containing missing information. I understand imputing missing values before data partitioning can lead to leakage of information. I'm using this R package MissMech ...
- 33
1
vote
0
answers
31
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Estimating Gamma PDF parameters from data with negative increments
Say we have collected data, and from a physical perspective we know that the collected data should increase positively with time. However the data looks more like this:
This data shown in the figure ...
- 565