Questions tagged [range]
range is the difference between the largest and smallest data value.
79
questions
0
votes
0answers
15 views
Why won't my xgBoost regressor predict above a certain value, even though it sees higher in training?
I have created my first xgboost regressor. I input some self collected data, which I scale using sklearn's standardScaler. The model is trained on approximately 25,000 samples, and then tested on ...
1
vote
1answer
7 views
In computing the range of raw scores, if the lowest value is 0. Should I still use it as my lowest value to find the range?
My professor gave us the raw scores. We need to find the range. The highest value is 93 and the lowest is 0.
Here's the raw scores
66,85,40,5,12,12,18,23,1,15,1,6,81,50, 21,0,27,5,13,0,24,22,5,1,32,12,...
3
votes
1answer
193 views
Why do we add an extra decimal place when we calculate the range in statistics?
From Mario Triola's textbook:
I understand that we add a decimal place when we calculate the median (it is possible to have (a+b)/2 ). I absolutely do NOT understand why we do that when we round off ...
0
votes
0answers
10 views
Calculating spread (standard deviation or CV) for ranges of values
Due to data suppression/confidentiality, I only have ranges of values, not individual data points. I have the sample sizes, the percentage of acres that receive ranges of fertilizer application rates, ...
1
vote
2answers
83 views
Marginal distributions given the distribution of range
I'm working with an upper diagonal distribution whose distance from the diagonal is Lomax Pareto (Type II) distribution.
The distance of a point from the diagonal line y = x is $\frac{\sqrt{(x_0-y_0)^...
0
votes
0answers
8 views
How do I properly weight an uneven (spacing) distribution of the numbers? [closed]
I have a set of numbers (depths actually) and I need to take the mean of another variable over these depths. For example, take the mean of temperature over a range of depths, however these depths are ...
0
votes
2answers
36 views
Descriptive measures
What is the percentage of people who earned between Rs 75 and Rs 125? If the given frequency table is below:
0
votes
0answers
10 views
what metrics to use to estimate accuracy of range prediction?
I trained a model that predicts customer's income given the features:
age, declared income , overdue total amount
active credit limit, total credit limit
Metrics used:
NIRDM - not in range distance ...
-1
votes
1answer
195 views
Calculate mean from range
Suppose we have data points like
How can we calculate mean from this dataset
0
votes
0answers
76 views
MLE of a parameter that lies in a certain range [duplicate]
Suppose $X1$ and $X2$ are iid Bernoulli random variable with parameter $p$ where it is known that $1/3<=p<=2/3$. Find the maximum likelihood estimator $p*$ of $p$ based on $X1$ and $X2$.
I could ...
0
votes
0answers
57 views
What is the distribution of sample's range, obtained from a normal distribution?
Let $x$ is a normally distributed variable:
$x\sim N(\mu,\sigma$).
I wonder, the distribution of the range.
I mean, let we have a sample(let size $n$) from the above distribution.
Let define
$...
1
vote
1answer
159 views
Any other way to calculate range of transformed variable?
I have been doing questions related to transformations of 2d random variables.
In a question I have to find a range for
$$u = (x-y)/2
$$
and
$$v = y
$$
where $x,y > 0$
So is it necessary that ...
2
votes
1answer
94 views
Unbiased estimator of standard deviation
I'm reading "Properties of range-based volatility estimators" where the authors talk about using the range of a distribution ($h$ - $l$) to estimate its volatility. Specifically, they say,
Daily ...
0
votes
1answer
22 views
If a false positive rate of α is desired, what is the acceptable range of false positives one would expect from a sample size of n?
For instance, suppose I design a test to have a false positive rate of 5%. I am going to perform this test on what is assumed to be an all negative population. If my sample size was 20, I would expect ...
2
votes
3answers
886 views
Find Q1 and Q3 from median and IQR
A study gives the following:
$n = 67$
mean = 73
sd = 68
median = 55
IQR = 66
Is it possible from this information to get the actual Q1 and Q3 values? I used the $n$, mean & sd to get 95% ...
0
votes
0answers
139 views
Convert negative to positive percentage range into 1-10 scale
I know how to convert a range of positive % numbers into any positive integer scale, but am having trouble figuring out how to do it when my % range includes negative %s.
Example:
I have the ...
0
votes
0answers
56 views
How to scale data to desired range? [duplicate]
I have a table with 3 columns X, Y and Z with n rows.
The range of the data is 0-255. But I wished to scale the values such that the range becomes from -p to +q (where I decide p and q). I randomly ...
1
vote
1answer
30 views
What are the broadest class of distributions for which the range statistic is ancillary to the expectation of the random variable?
Let $X_1,X_2,X_3$ be iid random variables such that $E(X_1)=\mu$
Define $X_{(3)}$ and $X_{(1)}$ as the maximum and minimum order statistics respectively.
I know that if $X$ is normal, $R=X_{(3)}-X_{...
3
votes
1answer
300 views
Distribution of ranges of normally distributed variables
I have four independent variables $x_i$, each of them normally distributed with $\mu = 0$ and $\sigma = 1$. What is the distribution of the range of the four variables, i.e., $\max(x_i) - \min(x_i)$?
...
3
votes
2answers
73 views
Statistical dispersion metric for single extreme value
I have around a million sets of 8 datapoints. I would like to rank these sets of 8 data points. I am trying to identify sets where there is a single extreme value and the other 7 datapoints are of ...
15
votes
1answer
2k views
What is the name for the average of the largest and the smallest values in a given data set?
What do you call a statistical mean that is calculated from upper and lower extremes in any given dataset?
For example, if you have a set:
...
1
vote
1answer
64 views
Expected value of CDF evaluated at sample min/max, with respect to sample size
I've been using simulation to investigate the behavior of cumulative density function evaluated at extreme values of a sample.
Functionally, my study has $n$ instrumented fish migrating downstream ...
3
votes
3answers
699 views
How to calculate a confidence interval for a series of Bernoulli Trials?
I have to test if a event have a p probability of happening. I can run this event as much times I like (given it can be run by a computer). So I was searching a way ...
0
votes
1answer
253 views
What does range in descriptive statistics mean
What does high range in my variable mean??. If I have a variable whose range is less ,what does it mean??
0
votes
0answers
21 views
Newbie wondering about standard deviation and how to detect outliers in new datapoints
So I have a dataset, with the count of records processed per day in each, e.g.
| 27th April: 3491 | 28th April: 2058 | 29th April: 9321 | 30th April: 1021
I want to be able to take a new day's count ...
1
vote
1answer
438 views
Significance of correlation with range restriction in x
Background
Range restriction can happen in various study designs and it affects the results of bivariate correlation or in multiple regression, for example. In some cases the range restriction may be ...
0
votes
1answer
77 views
Name for Standard Deviation over possible range (1-255)?
I have RGB brightness values over a possible range of 1-255. I am already computing Coefficient of Variation, but since my domain is strictly limited, I am interested in seeing a measure of how spread ...
0
votes
1answer
70 views
correlation with small range of data
I have two count variables. I want to calculate a Pearson correlation between them. However one of the variables only has a rangge of 1-7. Is it inadvisable to use Pearson correlation to study a ...
1
vote
1answer
648 views
multivariate normal distribution range [duplicate]
Simple question about MVN pdf. I understand the domain to be [0,1]. However, why does scipy.stats.multivariate_normal.pdf output values above this range. E.g.
<...
0
votes
0answers
127 views
How is this mean scale score range calculated?
I have the attached report for a standardized test (data in the report is simulated). I'm wondering how the column Mean Scale Score Range is calculated. Do the lines indicate the limits of 95% of ...
2
votes
1answer
11k views
Normalize an array of numbers to specific range
How can I normalize an array of values (e.g., {0, 3, 4, 7, 9, 13, 22}) to a range of [12, 24]?
2
votes
1answer
29 views
Mean nonequality test if data are intervals
If $X, Y$ are two sets of observations of two random scalar (univariate) variables, one can determine if the expected values of the two variables are unequal, with appropriate tests. My question is: ...
4
votes
1answer
3k views
What is meant by the interquartile range of ordinal data?
It is commonly said that the interquartile range (IQR) is suitable to describe ordinal-, interval- and ratio-level data (one of many examples found on the Internet). But calculating the IQR includes ...
3
votes
2answers
214 views
Does changing the point range of items of a construct measured through likert scale affect in any way validity and reliability of the construct?
I am using a pre-existing universal tested scale to measure a specific construct. The construct is measured through 5 items on a 5 points likert scale. However, I would probably need to change the ...
0
votes
0answers
62 views
How to create a dynamic range?
I have data for the entire last year. It is simply a value of a variable for every minute, grouped by days. What I need to do is take all this data and define a dynamic range - that is, define two ...
0
votes
0answers
224 views
Comparing ranges of different groups
I have data that's like as follows
$A : 133-134$
$B : 131-135$
$C : 135-148$
I have to check if $A$ is more "similar" to $B$ or $C$ where similarity is defined as smallest "distance" between the ...
0
votes
0answers
4k views
How to normalize data using Interquartile range?
I am trying to normalize a dataset using the Interquartile range (IQR), I've already gotten the value of IQR, which is Q3 -Q1 (difference between 75th and 25th percentiles), what should I do then?
For ...
-1
votes
2answers
2k views
Why does Mean deviation = Standard deviation = Range/2?
We know that mean deviation and standard deviation are two different things but why are both of them equal to Range/2?
Range ($R$) = Highest value - lowest value
Mean deviation ($\text{MD}$) = ...
1
vote
1answer
14k views
Calculating Range based on Mean, Standard Deviation and Varying Sample Size
I have recently began studying statistics with my learning material being a book on "Basic Statistics for the Behavioral Sciences by Kenneth D. Hopkins and Gene V Glass (1978)", and so far I have ...
1
vote
0answers
364 views
Using Regression to predict target variable of small range
I am using Random Forest regression (of scikit-learn). In the train set, the target variables only range from 1-6 ( & they can meaningfully, only be integers, in my case). The target variables are ...
1
vote
0answers
839 views
Finding the upper limit of range for standard deviations
A very basic question - from someone who last studied Maths 25 years ago and has forgotten more then he ever learnt!
I have a data set of weekly sales for products, and wish to determine what stock ...
1
vote
1answer
190 views
Constraining a model to output only a range between 1 to 100 (without using logistic regression)
Currently, I am modelling the results of game theory experiments where two parties negotiate to divide a fixed sum of money between themselves. Y is recorded as the percentage of the money which the ...
1
vote
0answers
20 views
What all can be found from the given information?
Sums and products of every pair of n numbers are given, however it is not known as which pair's sum and product they are. From this information we can find:
a) Mean of the n numbers
b)Variance of the ...
2
votes
2answers
2k views
Calculating the variance of a truncated normally distributed RV given the prob. of a range
Let's say that I have a Truncated Normal Distribution (from a to b) with mean $m$ (where $m$ is the mean of the truncated Normal) and not known std. I know the probability for the range $m-d$ and $m+...
1
vote
0answers
77 views
Convert Probability of Landing in Range to Log Normal Probability Distribution
I am working on a dataset that shows the probability of the FOMC Fed Funds Rate being in a specific range after a future FOMC meeting. The probability is based on a log-normal distribution (bounded by ...
1
vote
1answer
3k views
Normalization when Max and Min Values are Reversed
I'm running an experiment where I'm continuously sampling from a dial hooked into a physiological recorder as a hack because the dial won't interface with the equipment we're using any other way. By ...
8
votes
3answers
5k views
Median > Mode > Mean > Range
My question is: Is there a set of data which allow the median to be larger than the mode, the mode to be larger than the mean and the mean to be larger than the range? If so, is there a pattern, or a ...
3
votes
0answers
27 views
Distributing uniformly N values into P classes
I'll try to briefly explain my need.
I have N values and P classes. I need to calculate the boundaries for each class such that ...
2
votes
3answers
2k views
How to judge skewness based on the mean and range?
Is there any rule of thumb to judging skewness of data based on its mean and range (max-min)? I found such implication in one of the papers I'm reading and I can't see why it would be obvious.
The ...
-3
votes
1answer
377 views
Poisson Ranges for Small Numbers? [closed]
I came across a presentation from a major university on R and Monte Carlo simulations. It mentioned that if you wanted to create ranges for numbers you are going to use in a Poisson distribution, you ...
