Average most often refers to the arithmetic mean, but more generally to measures of central tendency that use most, or all, of the data values. Examples include trimmed mean, Winsorized mean, harmonic mean and geometric mean.

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46 views

Which PDF of X leads to a Gumbel distribution of the finite-size average of X?

Consider the statistic "average of $N$ idd random variables $X_i$", $$S_N = \frac{1}{N} \sum_{i=1}^N X_i$$ Consider also that, by a numerical experiment, it is observed that the distribution of ...
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11 views

categorical weighted vector [on hold]

I have 4 variables Each variable is an ordered categorical variable The range of values for each variable is ...
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1answer
19 views

How to get a mean from multiple categorical fields

I have some census data on income I would love to analyze. But income, in the data, is split into different income groups, each group is a column containing the number of people in an area that earns ...
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7 views

Calculate sentiment and compare it to other variables

Everyday I receive a data of three variables (neutral, negative and positive). ...
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2answers
134 views

Simple example of how “Bayesian Model Averaging” actually works

I'm trying to follow this tutorial on Bayesian Model Averaging by putting it in context of machine-learning and the notations that it generally uses (i.e.): ...
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10 views

Average timeseries with regards to information

I am defining the distance between timeseries using a compression based metric (CDM) https://blog.acolyer.org/2016/05/10/towards-parameter-free-data-mining/. In that context, do you guys have any idea ...
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6 views

CFA indicators - means across raters

I have a CFA model that has six items, each rated by 2 raters (no rater ids). The models with residuals across raters or items was nonidentified, and the second order model was non identified. The ...
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2answers
30 views

Estimating classifier performance using cross validation, average accuracy and standard deviation and

I want to estimate a classifier accuracy on benchmark data. Data is not split into training and testing so I use 5-fold cross validation, using 80% of data as training and testing on 20%. Each test is ...
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0answers
13 views

Average treatment effect on the treated

There is something conceptual I don't understand with average treatment effect on the treated. Say you have two binary outcomes $Y_i(W_i)$ in which $W_i$ is either 0 or 1 (treatment). So I either ...
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17 views

Trying to calculate industry averages for female employees

I have a dataset that lists employers in a particular industry, the number of employees they have and the breakdown of employees as male or female. I'm trying to get a number that reveals something ...
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1answer
76 views

How do I test if the average difference between two groups are statistically significant?

Suppose I conduct a survey of 1000 males and 1000 females about their age and I found that the average male age is 50 while the average female age is 40. What information do I need and how do I test ...
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27 views

How to report standard deviation while averaging a dataset multiple times?

This question appears simple but it may not be. I have a year long, 1 degree, daily, 3-d global climate data set (temperature) representing different latitude, longitude, and days. That means the data ...
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1answer
63 views

Weighted average vs “unweighted” average in probability

[UPDATE] Terms I used: - Weighted average: weighted arithmetic mean - "Unweighted" average: arithmetic mean I went through some of the forums here and looked for explanations online but I couldn't ...
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20 views

Is weighted average the right method for this business problem?

I have 5 customers who order 10 products. Come April 1, 2016, the prices of all 10 products are increasing. The 5 customer each order all the 10 product types. I have the following: 1. Individual ...
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1answer
14 views

Calculating average of averages in absence of complete data

I have a dataset with three variables: ...
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0answers
27 views

Calculating the Title odds

Given a set of expected values within an event. How do you calculate the probability of each of them occuring the most? i.e. Who will win the league? total goals scored in a season , given expected ...
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1answer
38 views

How do you cross validate a regression model with a variable derived from historic information

I have a logistic regression model for conversion rate after sending a customer a voucher. The dataset consists of all previous occasions where customers were sent a voucher, with the response whether ...
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1answer
42 views

comparing averages of different sized groups

I want to look at the number of arrests per head of population in some counties. What I am doing is taking the census for each period and using 10 year periods (so dividing by 10). For 1810-19 I ...
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0answers
15 views

Determine contribution percentage

I'm trying to determine the individual category percentages once their weights have been applied. The easiest way to describe what I'm asking is to show my workings: ...
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0answers
15 views

Calculating mean and maximum with open ended bins

I am using excel and I need to work out the average lives of machinery as well as the maximum life. However all I have is the number of machines over ten years and the number of machines under 10 ...
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0answers
60 views

Types of Mean in statistics

Can anyone explain trimmed mean, interquartile mean and trimean with examples? And also explain what is the use of this and where we use in real life?
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1answer
21 views

Calculate Forecast Error: Different ways using the mean?

Example: I've got an forecast with 2000 values. Let's say they are for one year. I can group my values into months. Every month can include a different number of single values. (JAN with 200 values + ...
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19 views

How to compare 2 averages, when their sums are different

I am stuck at tring to find a convincing anwer to this question. Suppose I go a Shop A and Shop B to purchase Apples and Bananas / / Now If I calculate average Cost per Product in SHOP A = (10*10 ...
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5 views

Product Matching: Calculating average score for data-points with penalty for outliers

I'm working on a product matching feature that works on datasets like the one below: ...
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2answers
99 views

Average curve from set of curves

I have done some initial analyses on some patient datasets regarding neuro-degenerative diseases. A method I've used is DFA (Detrended Fluctuation Analysis) in MATLAB, which produced a family of ...
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1answer
17 views

How to properly calculate average need-based aid met by an institution?

As an institution we give out a certain amount of financial aid every year (need-based aid) to each student. This need-based aid does not always meet the students estimated need. My task is to compare ...
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29 views

Average waiting time in an exponential distribution

I have come across the following problem in one of my courses: Let's suppose a patient in a hospital is waiting to be picked by one of the two doctors available. The time till a new pacient arrives ...
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1answer
9 views

Average value when it is not included in the support

There are a few ways I think of averages of a (discrete) random variable: Average is an OLS estimate of running a regression of the random variable on a constant term. In that sense, it is a value ...
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12 views

How to decide about the number of looks (window size for ensemble averaging) in SAR images?

This question has frustrated me for a while. In order to find an answer I sent an email to prof. Yamaguchi, the author of the paper Four-Component Scattering Power Decomposition With Rotation of ...
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1answer
25 views

Method For Calculating Performance from Average Scores

In a simplification of my problem, let's assume we have players who can get an integer value score $s$ considering $\{ s \in \mathbb{N} : 0 \leq s \leq 3 \}$. Same sample data for scores: Player A: ...
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1answer
26 views

How do I compute an average when one of the measurements couldn't be measured?

In my biology class we were doing a lab on respiration rates of peas. We used a respirometer with a small pipet tube (markings up to 1 mL) to measure the volume of gas; by immersing in water, the gas ...
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1answer
38 views

Why 'Assumption of Uniformity' for Mean?

I am teaching some very basic statistics for grouped data. In a different class a few years ago I made an 'assumption of uniformity' about the data: within bins, data is uniformly distributed ...
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1answer
58 views

SVM classifier - can I average multiple models?

I'm performing SVM classification on a relatively large data set (~1M rows, 4 variables). I want to assign a classification score to each row, not evaluate input parameters, so following the top ...
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1answer
25 views

Estimate group averages

If I have 100 numbers from two separate groups $X$ and $Y$. How can I manually estimate or derive an algorithm to automatically estimate $AVG(X)$ and $AVG(Y)$? I know all the numbers, but I don't ...
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1answer
40 views

Should I exclude an individual being evaluated from group average?

I am working on some statistics of work related performances. Now at first I did my code to calculate the performance of a single individual and compared it to the average of a group in which the ...
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0answers
92 views

Recommendation System in Python - weighted average with negative factors

I am building a recommendation system in python on the 100k movielens dataset. My code build a movie/user matrix where the (x,y) element is the rate that the user y gave to the movie x. Since i want ...
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1answer
33 views

determine the mean cost per unit

I have N orders. Each order consist of x units and I know the total cost of each order. If I would like to determine the mean cost per unit do I use approach 1 or 2 listed as follows: (1) Determine ...
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1answer
49 views

Does Average have Units

I know that the average of a discrete random variable X can be estimated as:$$\widehat{E[X]}=\frac{1}{N}\sum_{i}x_{i}$$ where $i$ are the units we are averaging over. In practice, we just call ...
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27 views

Average many logistic regression results?

I have performed logistic regressions on several similar data sets (same type of data, different locations). I have 9 different observation types, 11 predictors, and 8 data sets (~3000 data each). I ...
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1answer
32 views

Calculate 3-year average on survey results

Statistics is not a normal part of my job. I've been given survey data from three years. Survey data includes a number of categories the respondents are split into. There is a set of five possible ...
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0answers
12 views

Trouble understanding equations with a mix of variances, expected values and means

Let's assume we don't know the real value $\mu$ of the average of a of random variable $x$. We can find an estimator for the variance using the Bessel correction: $$\widehat{V(x)} = ...
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0answers
22 views

Estimating actual score from small sample when population known

My inclination here is that there's no statistically sounds way of doing this, but I want to verify this. Suppose you have a population P, and you are measuring test scores across the population such ...
2
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1answer
63 views

Probability that the average is within range

I'm currently preparing for an exam, and I just can't seem to grasp how to go about the question given the following information: Information: A brick factory produce bricks whose length $X_i$ can be ...
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1answer
45 views

Bounding “an average”?

I'm doing a practice problem that is about processing orders. The assumptions are: "On average 40 orders are received" "50 orders per day can be processed" The task is to formulate notions about ...
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2answers
55 views

Handling null values when taking averages

I am currently working with a universe of 100 companies and interested in how they compare on certain metrics. Some companies do not report all metrics that I am interested in so I am reporting them ...
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0answers
15 views

Any algorithm for knn average?

I have a set of 10 features in a dataset corresponding to member purchase behaviour. I want to use knn to determine nearest neighbours for each member from test dataset on the train dataset based on ...
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0answers
19 views

A revision to a question I asked yesterday but got no response to on calculating average tenure

Here’s my question and it’s going to be pretty long winded. My company works in the online space and we sell subscriptions. We’ve been selling subscriptions since like 2011. My boss wants me to ...
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0answers
37 views

Understanding how standard deviation effects overall life when two variables are used

What is the total number of wheel lives of a railway car based on the following maintenance details? Every time an railway car comes in for servicing the wheels are brought through a lathe to have ...
2
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1answer
67 views

What is average tree size?

Suppose that you generate a sequence which stops with prob q at every step or proceeds with prob p. That is you will get bernulli sequence 0 or 10 or 110 or 11...10 with corresponding lengths 1, 2, 3, ...
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10 views

Recommendations based on Averages

I have a website where people can rate objects. Each objects has a number of properties. Objects do not all have the same number of properties, it could have anywhere from 1 or greater. All the ...