Questions tagged [distribution]

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Gbm prediction distribution different to training data

I’m doing a regression on a dataset using lightgbm. For the training data the response variable has a non normal distribution which is multimodal. However, the predictions out-of-fold have are ...
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Non-Gaussian like distributions - Classifier of source data fails on target data

I ask you for help on a classification problem (classes are represented by the numbers 0,1 and 2). All features are extracted from time series data (fundamental is sinus shape). I have a source ...
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Scalling features for competition participants

Hello there and Happy Holidays. I have a data set with each row representing a race with 6 participants, with each participant having its own column for each feature. The target variable is ...
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19 views

Normal vs Uniform Distribution for machine learning

I have a dataset that follows Zipf's law such that the majority of the values are concentrated at one end, with the remaining items containing a very small percentage. Training on the dataset as is ...
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1answer
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distribution difference between image and text

Once for the task of image captioning I've read that, the features extracted from image and text by deep networks are from two different worlds and got different distribution. My question is how is ...
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A/B Testing (Binomial Distribution vs Random Distribution)

When performing an A/B test for the number of clicks for users viewing (each view is an impression) two variants of an ad, a binomial distribution can be assumed where each variant has a constant ...
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1answer
31 views

What is a distribution-wise asymmetric measure?

I was trying to understand KL-Divergence, $$D_{KL} \langle P(X) \Vert P(Y) \rangle,$$ and was going through its Wikipedia article. It says the following In contrast to variation of information, it is ...
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1answer
41 views

How to find the best fitting parametric distribution for an empirical dataset (stock returns)?

Given some real-valued empirical data (time series), I could convert it to a histogram to have an (non-parametric) empirical distribution of the data, but histograms are blocky and jagged. Instead, I ...
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1answer
50 views

Normal distribution and Random Forest

I have big table in dataframe (600k rows) which has y column (the variable I want to predict) and other 4 other columns that are the X. I have run RF regressor and I got score of 0.87 when I run it ...
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Tensorflow Model not returning a Distribution object when having DistributionLambda as last layer in a multitasking model

I am building a TF CNN model that takes a picture as input and has 3 outputs (multitask learning). On one of the output layers, I would like to output a distribution object, ...
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2answers
26 views

How to generate a random sample and distribute values based in an probability distribution?

I want to generate a random sample based on this probability distribution: The line is the KDE of the histogram. My random sample will have n values, the value is ...
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How to find a probability distribution the parameters of which do not impact each other like mean and variance in normal distribution do?

I need to find a probability distribution to fit my data. My data has two important features, duration and activity count. Duration means how long one sequence lasts and activity count means the ...
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1answer
26 views

How to interpret KDE distribution graph?

I would like to know how to interpret this distribution graph. I have been doing an exercise from the book called 'Python for Finance Cookbook' by Eryk Lewinson. It does not give an in-depth ...
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21 views

What observations can you perceive from the following table?

I am preparing my thesis presentation and I want to give a clear understanding of the data that I have collected for the jury members. I understood the data very well, but I feel like I am lacking a ...
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1answer
22 views

[under/over]-sampling teaches model the wrong distribution?

TLDR: Will under/oversampling during the training phase teach the model the wrong distribution and adversely affect accuracy? Let us assume you want to train a classifier to differentiate between ...
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1answer
33 views

Unable to transform the variable to normal distribution

I have a variable called 'list_price' in my data ,which is not normally distributed. Here is the screenshot of how the distribution looks like before transformation Tried transforming it with the ...
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Calculating probability from a distribution

I have a histogram/count plots of average time a property is in the market. Given this distribution, I'd like to calculate the probability that a similar property will be leased within 'x # of weeks' ...
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1answer
12 views

Getting a balanced sample across many variables

Let’s say each element in my population has several attributes. Let’s call then A, B, C, D, E, F. Let’s say, for simplicity, each attribute has 10 values (but could be any number between 2 and 30). ...
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1answer
38 views

Finding the worst affected industry due to COVID in terms of unemployment

My goal is to find the worst affected industries from COVID—19 in terms unemployment. In terms of the data I will use for this task, I have a time series county-wise unemployment rate data of each ...
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1answer
22 views

Can the extent of variability within a dataset be reflected through clustering?

As an example: I need to compare the extent of variability amongst houses belonging to 4 different architectural eras - I want to see how different the houses are within each group and then compare ...
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what kind of distribution is followed by word and sentence vectors generated by TFIDF ,word2vec,glove,bert,flair?

what kind of distribution is followed by word or sentence embedding vectors generated by TFID or pretrained models like word2vec,glove,bert,flair ? is it continuous or discrete or any other ...
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1answer
28 views

What is the distribution of the goal feature in this dataset

https://www.kaggle.com/kemical/kickstarter-projects I was checking the distribution of the "goal" feature in this 2016 KickStarter data set. I figure goal would be more normally distributed ...
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1answer
20 views

A good machine learning approach for distribution of a whole?

So I had done with different classification, regression and clustering approaches for predictions of values etc. I was wondering if there is a machine learning approach for distribution of a whole ...
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1answer
61 views

Naive Bayes vs Full Bayes model classifiers

I have a hard time to understand when Naive Bayes works better than Full Bayes. In general, i know that naive bayes does the assumption that features are independent given the class. However, if ...
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10 views

Machine learning. Input: set of distributions, Output: distribution

I have a set of features where typical machine learning techniques do not work very good. All features have very different distributions, some heteroscedasticity is also present. The distribution ...
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83 views

How to estimate tail distribution for computing Conditional Value at Risk in python?

How to estimate parameteres of generalized pareto distribution in python? 🙏 I solve the task of computing Value at Risk and Conditional Value at Risk. ...
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1answer
27 views

Understand how to simulate a statistics [closed]

This solution describes how to simulate statistics to find a confidence interval. A journalist called 1000 people in town to ask who will they be voting for out of candidates A and B. The observed ...
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1answer
20 views

How to draw a sample from data set with respect to a given categorical or numerical variable based on given freely chosen distribution? (Python)

Say I have a data set for some past period. Now new data appears and for a given variable in the data and we find that the distributions have shifted (for example with "age" it would be that suddenly ...
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12 views

Modeling dependence among outputs in neural network

If I am modeling multiple outputs in a neural network, does modeling them all jointly in 1 neural network capture conditional dependencies? My understanding is that each output component would share ...
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22 views

How to distinguish Multivariate Bernoulli Distribution from Binomial Distribution,Multinoulli distribution,Multinomial distribution?

Ok While studying naive Bayes I came across this question and from the accepted answer I reach to this blog. While reading this blog I got a clear idea of how Bernoulli distribution turns to (...
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The data set missing values and percentage of data that would remain unaffected

Can not understand question and answer to it given on DS questions site (see link below): Q3. You are given a data set. The data set has missing values which spread along 1 standard deviation from ...
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Professionals appear to interpret sample correlation (e.g. Karl Pearson) as if it represents linear correlation. Is it the correct interpretation? [closed]

I am stressed following the wrong interpretation. What is the correct way of understanding a correlation coefficient.
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1answer
53 views

Change distribution of a vector

I have the following vector ...
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10 views

Given a dataset how do i determine the number of modes in the underlying distribution?

given some data is there a technique determine the number of modes (Unimodal distribution, bimodal distribution etc.) without plotting and visualization?
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Compare the variances of two categorical distributions in a repeated measure design

I ran two model-building procedures with different parameters on the same sample and obtained the selection of my optimized hyperparameter for each outer fold (each of the analyses had 100 outer folds ...
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14 views

Text data distributions comparison

I would like to know what is the best method to compare the different text data distributions. I am working on text classification. I built a model using the old dataset. Now, I would like to know, ...
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1answer
28 views

How is the E(X) of a Poisson distribution lambda? [closed]

I was recently learning about the Poisson distribution, and was very perplexed about the E(X) equaling lambda. Like how did lambda even come into the picture here, isn't it a symbol of wavelength? ...
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3answers
720 views

Is there a cost associated with converting Koalas dataframe to Spark dataframe?

I know that pandas works "under the hood" with numpy arrays stored in dictionaries. In contrast, Koalas works with the underlying Spark framework. Does that mean that there is no extra cost associated ...
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1answer
56 views

How to resample one dataset to conform to the distribution of another dataset?

I have two datasets with 20 features, but with different feature distributions (DS_A and DS_B). How can I sample the DS_A to make its distribution similar to DS_B, with respect to multiple features?? ...
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1answer
31 views

How to interpret axis of Histogram and distribution curve?

After doing statistical analysis of data I got the below figures: The data contains a line length in meters which is represented with Line(m). The purpose here is to confirm the distribution behavior ...
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1answer
47 views

difference btw data distribution and frquency distribution

I have a dataset with 'n' features and corresponding labels(binary in nature). How can I calculate the data distribution and frequency distribution of the same? What is the difference btw the two?
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30 views

Calculate marginal probability distributions of a dataset

I have a dataset with 'n' features and a label(binary) corresponding each entry. I am using a predicitive model to predict these labels using those 'n' features. Now, I wish to know the marginal ...
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1answer
225 views

Confidence value for face recognition

In the context of face recognition I have the following histogram: blue bins count the comparison distances for "self matches" (comparing two images of the same person). Orange bins count the ...
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1answer
30 views

Synthetic time series generation according to some distribution

I'm trying to develop a change detection model that uses sliding windows. Given a time series with some features I've a sliding widows that analyses that time period and compares with a successive ...
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42 views

SQL Oracle - Excel's BETAINV function (Inverse cumulative function of a beta distribution) in SQL Oracle [closed]

Is there a function equal to Excel's BETAINV(probability,alpha,beta,[A],[B]) in Oracle SQL Developer? Or a similar one which I could use to return the inverse cumulative distribution function of a ...
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47 views

Select the right distribution

I have a dataset like: ...
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1answer
21 views

Testing for gender composition between groups

I did kmeans with k=4 and I would like to find out if there are any differences in the composition of gender between the 4 clusters. Do I use Fisher's Exact Test of Independence? Is there any ...
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2answers
30 views

evaluation metrics for multiple values per session

I have an application that executes my foo() function several times for each user session. There are 2 alternate algorithms that i can implement as "foo" function and my goal is to evaluate them based ...
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3answers
248 views

Regression: How to deal with positive skewness in continuous target variable

I'm working on a regression problem. My aim is to "learn" the distribution of a continuous target $y$ as good as possible to make predictions. My model looks like: $$y_i=\beta X_i + u_i.$$ $y$ is ...
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1answer
46 views

Univariate Outlier Detection

Let's say I have a dataset with the following format: customerid product orders_in_last7days orders_in_last6days orders_in_last5days orders_in_last4days orders_in_last3days orders_in_last2days ...