Questions tagged [distribution]

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0answers
19 views

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
46 views

Change distribution of a vector

I have the following vector ...
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8 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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11 views

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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7 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
26 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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2answers
79 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
20 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
25 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
40 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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0answers
18 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
56 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
27 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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0answers
21 views

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

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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0answers
45 views

Select the right distribution

I have a dataset like: ...
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1answer
18 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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1answer
21 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
107 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
28 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 ...
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0answers
15 views

How to estimate the marginal distribution of a class with respect to one predictor in a classification task?

I have a dataset with a binary dependent variable $y \in \{0,1\}$ and a set of predictors $x1,x2,..,t$. Here, $t$ is the time in minutes (in 24 hrs, that is $t \in (0,1440)$). I want to estimate the ...
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1answer
22 views

Generating random numbers from best probability distributions?

I have done some statistical distributions on real-world data. The distribution fitting gives me the below results (lognormal fits the best on data based on chi-squared test): ...
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24 views

How to do normalize distribution technique on a simple matrix?

This is just a practice about normal distribution in MATLAB and not a real project. I created a simple matrix and want to test normal distribution on it, it's ...
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1answer
19 views

How to set and check normal distribution on a data set?

Sorry if my question is simple, I have a data set with two class and want to check and set normal distribution on it(if it was necessary, in MATLAB). But the question is that I should use it on every ...
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1answer
32 views

How does $\chi^2$ feature selection work?

I can't find the information how $\chi^2$ are used to select numerical features for a model. ...
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1answer
35 views

The distribution of dataset train and test are the differents, how to fix this?

I am new in data science and like some help to understand my problem. For instance, I have two signals non-stationary for the same condition (figure 1). I acquisition them at different times(in the ...
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1answer
21 views

Can continuous dataset have negative values? [closed]

As in the description, I want to choose continuos dataset with temperatures and the minimun value is -40 and maximum is 51. Is that OK? Can we have negative values in continuous distribution?
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0answers
41 views

Use of PYMC distribution.dist()

In pymc3 documentation, it specifies that the .dist() member for distribution allows the distribution to be used without a model for sampling and use of the logp functions e.g. ...
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1answer
67 views

When to use t-distribution instead of normal distribution?

According to the Student's t-distribution wiki article the t-distribution is used instead of the Normal distribution "when estimating the mean of a normally distributed population in situations where ...
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0answers
20 views

Using normal distribution data with high amplitude

I am using some data from a csv file to train a model which detects credit card fraud. The data set is from Kaggle and has 284,xxx samples each with 30 features. After some visualization in Python, ...
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1answer
81 views

Why do train, test, validation datasets need to have the same distribution?

I've found a lot of martial on how to deal with differently distributed train/test/validation data sets, however I'm struggling to find out why they they need to have the same distribution. Can ...
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0answers
20 views

How to avoid dataset shift or covariate shift? [duplicate]

I wonder If there can occur a dataset shift or covariate shift through the following train_test_split-method? ...
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0answers
4 views

the metric that can be used to characterize and compare different histogram

There is a set of different data set, each of which corresponds to a histogram. Are there any metrics that can be used to characterize the shape of each histogram, and further compare different ...
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0answers
23 views

Co-joining multi-peak histograms

I am analysing a bunch of data files which represent responsiveness of cells to addition of a drug. If a drug is not added, cell responds normally, if it is added, it shows abnormal patterns: , . We ...
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0answers
10 views

How to estimate claims for warranty analytics where continuous improvement reduces warranty claims?

I have a situation where a company who has warranty claims on its product and they want to know that is it possible for them to extend that. Now the case is that they do improvement on the existing ...
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1answer
25 views

Predicted and true values distributions comparison

Is this alarming when a distribution of predicted values differs from a distribution of true values? I use xgbregressor and get the following plots Usage of boxcox doesn't improve the case. My data ...
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0answers
19 views

Normalization of Distribution of numeric features and target

Here, I am talking about the Normalization of Distribution of Features/Target, not normalization/scaling of them. I've been seeing Notebooks which normalize some features and the target variable, ...
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0answers
56 views

dataset shift, covariate shift or sample selection bias in small subsets?

I try to show from which training data size on which machine learning method (CNN, SVM etc.) achieves better performance. For this I would like to use subsets of different sizes from the datasets of ...
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0answers
104 views

difference between normal skewed distribution and skewed distribution

From what I've read normal skewed is a distribution that has all the properties of normal distribution and is skewed: according to this resource:https://www.statisticshowto.datasciencecentral.com/...
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0answers
54 views

How to combine data having similar distribution?

I have a collection of time series data with data points of around 2 years of daily data. I am thinking of a way to increase the number of data points in it so that the neural network gets a better ...
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0answers
19 views

Is it possible to train probabilistic model to return several distributions?

I have nonlinear data of function y(x), which is let's say parabolic. At some points of x there are several y's (look at the picture). Is it possible to train a probabilistic model to return several ...
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2answers
185 views

Fitting a distribution to data

I have a large data set of property values at two points in time. I have calculated the change in value between those two points. I want to assess which distribution most closely matches the variation ...
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2answers
67 views

How this visualisation was made?

I really like how this visualization represents the survey participants. Is any tool for that? (Or R/python library?)
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3answers
340 views

xgboost: Is there a way to perform regression on rates/percentages data?

I have a dependent variable, $Y$, that is made up of rates/percentages data, so each value is between $0$ and $1$. I was attracted to the xgboost library because it allows focusing in on specific ...
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1answer
29 views

How to generate 12 independent random weights which all add up to one

I'm using Palisade's @Risk software with a triangular distribution to generate 12 random weights which must add up to one, but I get a lot of negative numbers. Is there a straightforward way to set ...
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1answer
205 views

CUDA 8.0 is compatible with my GeForce GTX 670M Wikipedia says, but TensorFlow rises an error: GTX 670M's Compute Capability is < 3.0

According to Wikipedia, the GeForce GTX 670M has a Compute Capability of 2.1 (and a Fermi micro-architecture), which is confirmed by TensorFlow (I can read "2.1" in the error it rises). Wikipedia ...
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1answer
85 views

Why do seaborn.dist and pyplot.hist generate two different looking histograms on the same data?

I'm looking at telecom customers data. Two of the variables I'm looking at currently are: Monthly Charges - The total amount charged to the customer monthly. Is Senior Citizen - Whether the customer ...
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12 views

Which distribution should I use for Naive Bayes algorithm(Gaussian or Rayleigh)? What to do with categorical data?

I am predicting whether credit card application of an individual would be approved or not given his/her credentials. I have the following dataset: The variable descriptions are as follows: I need ...
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2answers
67 views

Effect of skewness in data

I am preparing classification model. Many of numeric variables are positives skewed. Should I change a distribution of variables to be more Gaussian?
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2answers
26 views

How do I fix mis-rendered matplotlib?

How do I correct my data or format it so that it is presentable, and fix my graphs? Dataset is 345551 rows × 7 columns. I am using numpy, pandas, seaborn and matplot lib. It seems that my pricing ...
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0answers
11 views

Compare large prediction with observed values

I have test scores for a lot of schools and I created a performance index calculated using the last score of a state test. This index is supossed to predict the performance of the school in the next ...