variance Questions
15
I'm trying to find an efficient, numerically stable algorithm to calculate a rolling variance (for instance, a variance over a 20-period rolling window). I'm aware of the Welford algorithm that eff...
Gobetween asked 28/2, 2011 at 20:46
0
This is both a question and a poll. Considering the following case:
trait Mat[+T]
implicitly[Mat[Product] =:= Mat[_ <: Product]]
/* Compiler error:
: Cannot prove that com.tribbloids.spike.d...
Exponible asked 7/5, 2023 at 18:31
5
Solved
I wasn't sure if this should go in SO or some other .SE, so I will delete if this is deemed to be off-topic.
I have a vector and I'm trying to calculate the variance "by hand" (meaning based on th...
4
Solved
I have survey data from a stratified simple random sampling design where some strata contain only a single sampling unit (even though the strata population size may be >1). These are referred to as...
1
Solved
I have a function that expects a short lived object. I would expect that I would be able to always pass it a long lived object. But I am getting a strange error when I try to encode that:
type F<...
Hydrokinetic asked 18/8, 2022 at 19:8
9
Solved
If I have a list like this:
results=[-14.82381293, -0.29423447, -13.56067979, -1.6288903, -0.31632439,
0.53459687, -1.34069996, -1.61042692, -4.03220519, -0.24332097]
I want to calculate the va...
Pushkin asked 23/2, 2016 at 16:47
6
Solved
I have a simple time series and I am struggling to estimate the variance within a moving window. More specifically, I cannot figure some issues out relating to the way of implementing a sliding win...
Parthenia asked 11/12, 2014 at 16:22
2
Solved
As I understand it when creating a supervised learning model, our model may have high bias if we are making very simple assumptions (for example if our function is linear) which cause the alg...
Komara asked 22/8, 2015 at 21:54
4
Solved
@uncheckedVariance can be used to bridge the gap between Scala's declaration site variance annotations and Java's invariant generics.
scala> import java.util.Comparator
import java.util.Compar...
Outhe asked 16/3, 2010 at 12:33
8
Solved
So, I've posted a few times and previously my problems were pretty vague. I started C++ this week and have been doing a little project.
I'm trying to calculate standard deviation & variance. My...
Aidoneus asked 21/10, 2015 at 20:20
1
I fitted a linear mixed model to agricultural data, accounting for unequal variances across groups (cultivars) by passing weights = varIdent(...) to lme. lsmeans is showing standard errors that do ...
Claustrophobia asked 22/1, 2022 at 2:30
3
I am working with sklearn and specifically the linear_model module. After fitting a simple linear as in
import pandas as pd
import numpy as np
from sklearn import linear_model
randn = np.random.ra...
Butternut asked 13/3, 2014 at 14:20
3
Solved
I want to extend Welford's online algorithm to be able to be updated with multiple numbers (in batch) instead of just one at a time: https://en.wikipedia.org/wiki/Algorithms_for_calculating_varianc...
Doak asked 1/6, 2019 at 0:23
2
Solved
Consider this short snippet:
trait Table[+A] {
type RowType = Seq[A]
}
Scala 2.11.7 compiler gives the following error:
covariant type A occurs in invariant position in type Seq[A] of type Row...
Careerist asked 1/11, 2015 at 2:57
4
Looking for a way to calculate Population Standard Deviation in R -- using greater than 10 samples. Unable to extract the source C code in R to find the method of calculation.
# Sample Standard De...
Skied asked 3/6, 2017 at 0:24
3
Solved
In a Python program, I need to generate normally-distributed random numbers with a specific, user-controlled variance. How can I do this?
1
Solved
Edit::
after all these discussions with juanpa & fusion here in the comments and Kevin on python chat , i have come to a conclusion that iterating through a generator takes the same time as it ...
Oconnell asked 2/9, 2020 at 4:21
2
Solved
I have rather huge dataset in which I would like to exclude columns with a rather low variance, which is why I would like to use the phrase NearZeroVar. However, I do have some trouble understandin...
Defecate asked 15/6, 2020 at 16:26
2
This should be very basic and I hope someone can help me. I ran a principal component analysis with the following call:
pca <- princomp(....)
summary(pca)
Summary pca returns this description...
1
Solved
Simply, I am trying to calculate the sharpness of an image as a part of a function in C# using OpenCVSharp.
As the 1st try, I used Laplacian Filter like this:
int kernel_size = 3;
int scale = 1;
...
8
Solved
I am trying to make a function that prints the variance of a list of defined numbers:
grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5]
So far, I have tried proceeding on making...
1
Solved
I've followed the advice laid out here for calculating the average of circular data:
https://en.wikipedia.org/wiki/Mean_of_circular_quantities
But I'd also like to calculate standard deviation as...
Contend asked 10/4, 2019 at 15:50
4
Solved
How can I calculate the population variance of my data using R?
I read there is a package called popvar but I have the Version 0.99.892 and I don't find the package
7
Solved
The C# spec states that an argument type cannot be both covariant and contravariant at the same time.
This is apparent when creating a covariant or contravariant interface you decorate your type p...
Fillip asked 24/12, 2010 at 20:22
4
Solved
What does the statement mean?
From here
ref and out parameters in C# and
cannot be marked as variant.
1) Does it mean that the following can not be done.
public class SomeClass<R, A>:...
Hennessey asked 20/5, 2010 at 17:33
1 Next >
© 2022 - 2024 — McMap. All rights reserved.