# Tagged Questions

A brief numerical description of a set of data.

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### statistics metrics or machine learning methods to quantify the relationship between a point and a group

There are several data groups: A1 = { A11, A12, A13, …, A1n} A2 = {A21, A22, A23, …, A2n} .. … … Am = {Am1, Am2, Am3, …, Amn} Here ...
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### I want to check the “affect of economic variables on the export of vegetable ” [closed]

I have used ARDL technique for that as I applied that technique following answer come to me. Value of Durbin Watson test (2.20). Please guide me how i can interpret that value?? In the long run ...
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### Normalize two distributions having high standard deviation

What would be a proper way to normalize two distributions with the following summary statistics, to make them comparable? Distribution 1 ...
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### How to validate simulation result with real data

I have made a computer simulation, which is a model of a machine process step in a real factory. This factory keeps track of certain KPIs (key performance indicators), like utilization (% of time in ...
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### Is this data's mean significantly different from zero?

I need to make a statement regarding whether the mean of this data is significantly different from zero. The data can not be described by a normal distribution. The population's size is 27, mean is -...
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### different ways of finding significantly different between two conditions with replicate or without

I know that one can do two-way ANOVA and then Tukey's HSD which is based on p-value and see if any sample or condition is superior to another. Data is in spectrocppsy. Means I am mainly working with ...
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### What is an acceptable R squared range for cross sectional data linear regressions?

May I know an acceptable R squared range for a cross sectional data analysis using linear regression? I think the requirement for this is lower than time series or panel data but would like to know ...
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### How do I find if two categories of ratio data are different in a manner that is statistically significant?

I have 4 categories of data, A, B, C, and D, that are ratios (market share). Each category has different numbers of records (prescriber-level data). Each record is a market share percentage that is ...
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### Single Sample t-test Hypothesis Confusion

In case you want data set.seed(100) hotel <- rep(1,100) hotel <- unlist(lapply(hotel, function(x) { runif(1,1,5) } )) NULL Hypothesis :- Hotel rating is ...
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### repetitive values

I have a data table that looks like this: USER AREA 1 X723 1 X278 2 X827 2 X567 2 X234 3 X735 3 X673 3 X346 4 X723 5 X678 Then I converted ...
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### Should I use an average to summarize ordinal data?

I need to work out a "average" (for lack of knowing a better word) of ratings or perhaps I could call them labels. Basically, I have a list of words that have been rated 1 - 3 for difficulty. 1 being ...
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### Which methods are used to define scoring bands when constructing a scorecard

I've constructed a credit scoring model using logistic regression. The range of scores go from 0 to 1000 (0 being very good and 1,000 being very bad). Now I'm designing the final score report and in ...
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### Using ABC package from R cran with a C++ simulator [closed]

I developed a simulator in c++ and I would like to use the R Cran package "ABC" from Csillery et al with that simulator. There seem to be many ways to make the two programs interact, but what would ...
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### Best metric for differences between shares

I am looking for a simple metric to measure the differences in expenditure shares on commodities which were calculated differently. Thus, there are two scenarios, both of which report expenditure ...
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### Difference is summary statistics: Gini coefficient and standard deviation

There are several summary statistics. When you want to describe the spread of a distribution you can use for example the standard deviation or Gini coefficient. I know that the standard deviation is ...
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### applying stats to ratings of products

Which should I trust more, a 4.5 stars rating with 46 votes, or 4 stars with 66 votes? This isn't Amazon where I can look at the distribution. Can I treat this like a binomial confidence interval? ...
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### How to calculate the weighted standard deviation [duplicate]

I have found many equations which claim to be for weighted standard deviation, yet all of these differ very slightly, and I am confused as to which is the correct one. I have some data in Excel, and ...
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### Comparing algorithms: runtime vs accuracy

I am comparing several algorithms with respect to their runtime and accuracy on several datasets. I follow [1] and compute the average rank using the accuracy and apply the Friedman and Nemenyi tests. ...
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### How to summarize MSE across groups?

I have a large amount of time series data collected for different groups over a 30 year period (dataset x) that can be broken down by sub-group. and corresponding time series data (dataset y) from a ...
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### what do the outputs of usl model mean?

I am trying to understand the summary of the universal scalibility law model: ...
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### Can't decide which data to use for summary statistics [closed]

I'm writing a report (for school) and I need to take data from my Excel to include in the report. One of the requirements is to include summary statistics (mean, mode, median, standard deviation) but ...
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### R- How do I compare percentages calculated from a subset of categorical variables?

I am trying to show that one percentage is significantly greater than another, and I am trying to perform the t-test for that, would that be correct? How would I do that in R? ...
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### ABC with Lotka-Volterra (or any dynamical system)

I have set out to implement a simple ABC rejection sampling algorithm in order to approximate the posterior distribution of parameters for Lotka-Volterra system and I have a few questions: 1) What ...
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### Anova vs Summary in the analysis of models and variables

I'm just approaching to the regression model analysis in R software. I would like to ask some particulars about the difference between the anova test used to ...
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### If the mean and median underestimate the true central tendency, why use them?

In skewed distributions, both the mean and the median can easily underestimate or overestimate the true central tendency. For example, have a look at this violin plot: The median is shown here in ...
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### Is it correct to use a summary statistic with known distribution under the null hypothesis as a test statistic?

How can a test statistic be found? Suppose that we have a sample, and we want to have a simple hypothesis. We know that under $H_{0}$ one of the summaries (which is a random variable) of this sample ...
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### Software/service that helps to estimate probability of some typical events in our lifes

I'd like to know what is a probability of some arbitrarily event happening in my life. Is there some services in the internet that can help me with that? What do I mean more precisely, is a service ...
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### What are the best methods for combining two recommendation model scores into one final score?

For each user, items are ranked based on scores which are coming from two algorithms using different data. This results in very different recommendations, some items are recommended basis first model ...
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### Developing a scoring method for groups of devices

I am hoping some of you smart statisticians can help me with a problem I am trying to solve. I am trying to build a model that will create a “Score” for sets or groups of devices that exist within ...
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### How do I interpret & present Meta Analysis Report to Non-Statisticians?

I have a Meta analysis report & I have to present the findings of the report to non-statisticians. There are 2 treatment groups & 5 endpoints. How do I explain pooled odds ratio, forest plot,...
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### Explaining Mean, Median, Mode in Layman's Terms

How would you explain the concept of mean, median, and mode of a list of numbers and why they are important to somebody with only basic arithmetic skills? Let's not mention skewness, CLT, central ...
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### Ways to summarize the number of users and messages sent as a comparative quantity?

I have a dataset where there are different groups of users, and the number of users in each group are different. They each send out messages to members in their own group and other groups. Eg. 3 users ...
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### Comparing two datasets with same variable

thanks in advance for anyone taking the time to read/answer this. I am comparing a ground-sourced dataset versus a satellite-sourced dataset for weather conditions, such as temperature. Both sets are ...
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### Mean and variance give good representation of data?

Imagine that you are given the mean and variance of a dataset but you do not know the distribution: Does it just the mean and variance give reasonable representation of the data? My guess is that it ...
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### What are the variance and standard deviation for a standard six-sided die?

I'm having trouble imagining what variance and deviation mean with a series of die rolls. That is, a fair die will fall with a flat distribution on all its values 1-6. The mean will be 3.5, but ...
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### How to read the summary for weighted least squares?

How do I interpret the summary for weighted least squares when I am trying to find the standard deviation function?
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### Get empirical distribution from group and compare groups mean

My question is not that easy so I'll try to formulate it as clearly as possible. First, I'll explain the situation: I'm doing repeated measurements of property A on specimens of material Y. I have 3 ...
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### Does dice coefficient same as accuracy?

I come across dice coefficient for volume similarity (https://en.wikipedia.org/wiki/S%C3%B8rensen%E2%80%93Dice_coefficient) and accuracy (https://en.wikipedia.org/wiki/Accuracy_and_precision). It ...
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### Determining forecast error of realtime prediction of binary outcomes

Given datasets consisting of a daily prediction and confidence percentage for each of a small number of binary outcomes, what is the proper way to calculate the forecast error of each series and of ...
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### Central Tendency measure for Response time?

Assume a classic scenario where there are bunch of employees and everybody are given tasks to complete on a regular basis and those tasks may or may not have deadlines. Objective is to to find a "...
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### A summary statistic for an unknown distribution

A trial consists of the following: a number is chosen uniformly from $\{1,2,\ldots,n\}$ then put through a function $f$ yielding a value in $\{W, L\}$. (Think successes, failures of the numbers.) Do ...
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### Prove $\sigma^2(aX+b)=a^2\sigma^2(X)$ for discrete random variable

I'm a total newbie to statistics/math in general, so please bare with me. I'm currently reading the book The Cartoon Guide to Statistics, and stumbled upon the following statement (p. 69):  \...
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### Should the arithmetic mean of a subset of population data be annotated as sample mean?

If I have population data, and I want to calculate the arithmetic mean of a subset of the population data (e.g. for a certain category of values within a certain range of $n$ observations), is the ...
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### Relationship/Correlation in this data set - does it exist?

Some analysis has been conducted for my business by an external company. The data, as it stands, only really tells part of the story and doesn't provide any real direction. The original study was ...
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### Comparison between the coefficients of two GLMs

I would be happy to have your thoughts on the issue of comparing the beta-values resulting from two different GLMs. Should the beta values be scaled before a statistical comparison? which test would ...
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### Which standard deviation of the cross-validation score?

When doing cross-validation for model selection, I found there are many ways to quote the "standard deviation" for the cross-validation scores (here "score" means an evaluation metric e.g. accuracy, ...
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### Best statistic for measuring prediction accuracy that is robust for outliers

I have recently built a model, designed for prediction. Initially, I chose model A over B - better RMSE and better MAPE. However, after carefully evaluating each prediction on my test dataset for ...
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### Statistic for deviation from uniform distribution

I am analyzing eye movement patterns. The data is from an evenly arranged three-by-three pattern of squares. I have, for each of the nine squares, the total time that a person was looking at it (=...