linear-regression | PHP package for computation of simple linear regression | Testing library
kandi X-RAY | linear-regression Summary
kandi X-RAY | linear-regression Summary
PHP package for computation of simple linear regression parameters
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Top functions reviewed by kandi - BETA
- Compute the regression coefficient
- Load a CSV file .
- Return the determinant of the matrix
- Compute the inverse of this matrix .
- Multiplies this matrix with another matrix .
- Calculate the sub - matrix
- Calculate the student s p value
- Multiplies this matrix by a scalar .
- Compute a stat matrix
- Extract x array from raw data
linear-regression Key Features
linear-regression Examples and Code Snippets
Community Discussions
Trending Discussions on linear-regression
QUESTION
I have an array of values (concentration values), with each value taken at a different time point. I need to fit a gamma-variate curve (formula is in the picture below) to these values (i.e. find alpha and beta such that the curve best fits those points - all other variables are known.)
an example of the values i might get (crosses), and the curve I'd want to fit:
I have no idea how to do this. I tried to fit a simplified version of the formula, one that can be solved by using linear regression, by using matrices but I couldn't get it to work. That version of the formula (in which you only solve for one variable, alpha) looks like this:
simplified version, which would also be fine:
my attempt to solve fit the linear regression curve using matrices, using the vnl library (https://vxl.github.io/doc/release/core/vnl/html/index.html) looked like this. I was following this guy's tutorial (https://machinelearningmastery.com/solve-linear-regression-using-linear-algebra/)
...ANSWER
Answered 2021-May-09 at 17:14This is a problem which is not best suitable to solving by ITK. While you could use ITK's Optimizer infrastructure, there are better/simpler choices.
Maybe try NLOpt? Here is an example of how to use it. Also, you could look at this code which fits a polynomial to points in 3D space.
QUESTION
I want to make a dataset using NumPy
and then want to train and test a simple model like 'linear, or logistic`.
I am trying to learn Pytorch Lightning
. I have found a tutorial that we can use the NumPy dataset and can use uniform distribution here. As a newcomer, I am not getting the full idea, how can I do that!
My code is given below
...ANSWER
Answered 2021-May-07 at 16:25This code will return you label as y and a,b as 2 features of 500 random examples merged into X.
QUESTION
I'm trying to perform a Multiple Linear Regression with TensorFlow and confront the results with statsmodels
library.
I generated two random variables X1
and X2
(so that anyone can reproduce it) that will explain the Y variable. The X2
variable is completely useless for this regression, it's just noise with a big scale so that the coefficient will result not significant (p-val close to 1).
At the end I should obtain a model that is basically. y_data = alpha + (0.25)x1 + (0.00)x2 + error.
I tried to adapt this code to my randomly generated data, but unfortunately, this is not working at all. This below is my try:
...ANSWER
Answered 2021-Apr-14 at 21:44The key issues with your code are the following:
- While it is necessary to add a column of ones to the features matrix
x_data
before running the regression with statsmodels, this is not necessary when running the regression with tensorflow. This means that you are passing 3 features to tensorflow instead of 2, where the additional feature (the first column ofx_data
) is constant. - You are normalizing
x_data
after the first column of ones has already been added withx_data = sm.add_constant(x_data)
. As a column of ones has zero variance, after normalization you get a column ofnan
(as you are dividing by zero). This means that the first of the 3 features that you are passing to tensorflow is completely missing (i.e. it's alwaysnan
). - While statsmodels takes as inputs at first
y
and thenX
, tensorflow takes as inputs at firstX
and theny
. This means that you have switched the features and target when running the regression in tensorflow.
I included a complete example below.
QUESTION
The I() function in R is used to create new predictor in Linear Regression, such as X^2 for example:
...ANSWER
Answered 2021-Mar-23 at 04:34I found the answer, seems to be as simple as:
QUESTION
I want to write a loop on R to perform linear regression on my dataset genes (= 210011 genes and 6 samples total; with columns the gene and the rows the samples) to identify how age and sex affect gene expression. I want to save the fitted value output from the linear regression in a new dataframe (generating basically a similar dataframe where on the columns there are the genes and in the rows the samples).
so the loop I wrote is:
...ANSWER
Answered 2021-Mar-06 at 13:36Create a vector of column names instead of column values. Try the following :
QUESTION
My problem is for the mtcars data set in R, I need to create all possible additive linear regression models where I'm regressing on the mpg variable. The null model is easy, as there's
10 choose 0 ways to get the null model, and 10 choose 1 ways to create a SLR on mpg; 10 choose 2 ways to create a two variable regression on mpg; 10 choose 3 ways to create a SLR on mpg; etc.,
So in total, as this is equivalent to summing across the 10th row in Pascal's Triangle, the total models I need to consider comes out to be 1,024.
Now, the other tricky part is I need to somehow store each model in some separate object so that all the 2 variable models are grouped together, all the three variable models are grouped together, etc, on top of also storing all them together (though perhaps there's a more efficient way to do this). The reason for this is my task is to look at all of these models, take their AIC scores and their Mallow's Cp scores, store those in a data frame, and then sort those scores from lowest to highest and keep the top 10. On top of this, I need to also be able to store, see, and have access to/use the two best 1-variable models through the two best 10-variable models because I need to provide the r-squared values and adjusted r-squared values for these various models along with the error mean square value. I'm still pretty/relatively new to R/coding in general, but I provide my attempt below:
...ANSWER
Answered 2021-Feb-24 at 00:12Your approach wasn't so bad. This is how I reproduced your work as you described it:
QUESTION
I am trying to run a regression in a loop with variables names changing at each loop. Similar to this setup here
At the end, I would like to save the fitted results in a list.
My code is the following:
...ANSWER
Answered 2021-Feb-11 at 10:23Construct the formula using sprintf
/paste0
:
QUESTION
I've recently been using tidymodels to run models and select parameters that best satisfy some objective function. For example using a hypothetical regression on mtcars data (using the regression examples from the bottom answer of this question as an example)
...ANSWER
Answered 2021-Feb-09 at 21:57There is an experimental package we are developing to do just this called workflowsets. You can install it from GitHub for now, if you are up for trying out a new, still-developing package:
QUESTION
I am complete beginner to AI as well as tensorflow.js. Currently following the Machine Learning course of Stephen Grider. I should have got a output after the following code but instead i got error. Please help:
code: linear-regression.js:
...ANSWER
Answered 2021-Jan-29 at 21:04The error is thrown by
this.features.matMul(this.weights)
There is a matrice multiplication between this.features
of shape [684, 1]
and this.weights
of shape [2, 1]
. To be able to multiply a matrice A (shape [a, b]
) with B (shape [c, d]
), b
and c
should match which is not the case here.
To solve the issue here, this.weights
should be transposed
QUESTION
I'm using this tutorial to perform a linear regression. Is there a way to add the summary (results) of the linear model to the plot in order to save it as a pdf.
This is the code:
...ANSWER
Answered 2021-Jan-27 at 12:12What you want to do is surprisingly difficult, which is why most people would not choose to do it that way :)
The closest solution I could find uses ggplot2
and a lot of other packages. It's possible to do the following:
- Create a summary table of the regression model using
stargazer::stargazer()
- Convert that to a PNG image file using
kableExtra::as_image()
- Convert the PNG to a grob using
grid::rasterGrob()
- Use
ggplot2::annotation_custom()
to embed the table-as-image-as-grob into aggplot2
chart
Note that as_image()
requires some other packages and an installation of phantomjs.
Here's an example:
However, there are other solutions that might be better such as a simple summary using ggpubr::stat_regline_equation()
or adding a table grob using the output of broom::tidy()
.
I think the simplest way to demonstrate all the options is in a RMarkdown file. Here is the code to copy into an RMarkdown file which you can knit in RStudio.
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