Category "linear-regression"

drop_First=true during dummy variable creation in pandas

I have months(Jan, Feb, Mar etc) data in my dataset and I am generating dummy variable using pandas library. pd.get_dummies(df['month'],drop_first=True) I want

What is the interpretation of a residual against fitted values plot?

After performing a regression, you get the residuals and the fitted values for the dependent variable. Plotting them can yield insights over the violation of OL

data partitionning function CreateDataPartition cross validation problem

I am trying to get predictions of a multiple variables model, its eplt, its made of 7 scores and one final exam score moy_exam2, I want to predict the later usi

How do I include the bias term with other weights when performing gradient descent in TensorFlow?

I'm a beginner with ML and have been following the Coursera intro syllabus. I am trying to implement the exercises using TensorFlow rather than Octave. I have t

Unbalanced panel error in PMG Analysis in R

I am trying to run a Fama Macbeth analysis in R, where I am using the 'pmg' function with the following code: Fpmg1 <- pmg(ret ~ HML_OBS + SMB + Mktrf + HML,

TENSORFLOW: UNSUPPORTABLE CALLABLE

I am trying to build the following model but am getting this error when I am finally training the model and trying to get it's accuracy. It gets stuck when I am

Multiple regression: R splits Variable into multiple

Hey there i want to explore the effect of Age and Gender on points of a test via mlr. Yet when i type model <- lm(punkte~ Age + Gender, data = df) R gives m

Vectorized form Derivation of Multiple Linear Regression Cost Function

Can some one with expertise explain how the following vectorized format of multiple linear regression is derived from given independent variable matrix with int

Warning message: 'newdata' had 20 rows but variables found have 1000 rows

#This is my model linearMod <- lm( Housing_Training$SalePrice ~ Housing_Training$MSSubClass + Housing_Training$LotFrontage + Housing_Training$LotArea + Hous

Two different answers for same expression in C

I have an expression which does the same calculation. When I try to do the whole calculation in a single expression and store it in variable "a", the expression

How to get the P Value in a Variable from OLSResults in Python?

The OLSResults of df2 = pd.read_csv("MultipleRegression.csv") X = df2[['Distance', 'CarrierNum', 'Day', 'DayOfBooking']] Y = df2['Price'] X = add_constant(X) f

Can we use Normal Equation for Logistic Regression ?

Just like we use the Normal Equation to find out the optimum theta value in Linear Regression, can/can't we use a similar formula for Logistic Regression ? If n

Why is numpy.linalg.pinv() preferred over numpy.linalg.inv() for creating inverse of a matrix in linear regression

If we want to search for the optimal parameters theta for a linear regression model by using the normal equation with: theta = inv(X^T * X) * X^T * y one step

Why does lm generate NA for each independent variable?

I tried to make a linear regression with the lm function, but the output is NA for every independent variable. The dataframe is numeric. I have already tried t

To which value in the statsmodels summary relates the error bar size in the plot?

With the following code, I get a plot how the regression was done for my data. In the plot also vertical (error?) bars are shown. To which number in the sum

How to obtain RMSE out of lm result?

I know there is a small difference between $sigma and the concept of root mean squared error. So, i am wondering what is the easiest way to obtain RMSE out of l

How to make predictions even with NAs using predict()?

I want to use predict() with a polr() model to predict variable z, as per the following code. This first is the df to train the model and the subsequent test da

recursively split a dataframe with partykit::lmtree as a stump tree

I am trying to recursively split my data using a stump tree based on the lmtree function from the partykitlibrary. The idea is the following: [1] for each varia

how to get the slope of a linear regression line using c++?

I need to attain the slope of a linear regression similar to the way the Excel function in the below link is implemented: http://office.microsoft.com/en-gb/ex

R SUR regression with systemfit gets error "LU computationally singular: ratio of extreme..." can work around but still concerned about error margins

Before I get into the problem, I want to acknowledge that I have seen that there is a previous question that has been answered, and it gave me an idea for a wor