Tania

Actif depuis 2014

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kfoldpredict do I understand it correctly?
Okay, I have built a crossvalidated regression tree. now i want to predict its accuracy for that i need the predicted value of y...

environ 11 ans il y a | 1 réponse | 1

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Question

How does predict with ensemble regression works?
This might be a silly question...iam using bagging with regression trees. I built for instance 10 different trees, then I averag...

environ 11 ans il y a | 1 réponse | 0

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Question

crossval with multiple linear model
Hey all, Currently, I am trying to build a crossvalidated linear model. I have started with the crossval function ... but I ...

environ 11 ans il y a | 1 réponse | 0

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Question

Crossvalidation of liinear models?
Hi, does anyone knows if there is a function to crossvalidated my linear model? i can only find it for descision trees unfortu...

environ 11 ans il y a | 2 réponses | 0

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réponses

Question

plotResiduals looks for multivariant outliers or?
Hey all! Does anyone know if plotResiduals (like described here: <http://www.mathworks.co.uk/help/stats/linear-regression-mod...

environ 11 ans il y a | 1 réponse | 0

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Question

Why do I get difference values doing this?-general syntax question
kfoldLoss(crossval(rtree2)) gives another value then the other kfold below: rtree3=(crossval(rtree2)); kfoldLoss(rtree3) ...

environ 11 ans il y a | 1 réponse | 0

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Question

predict does not work with a crossvalidated tree?
Hey, I am trying to do the following: rtree = RegressionTree.fit(X,Y,'crossval','on'); pred = predict(rtree,X) But unfort...

environ 11 ans il y a | 1 réponse | 0

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Question

Prepruning and postpruning regression tree
Hey! In the literature about decision trees they talk about pre-&post pruning. I was wondering if pre pruning could be com...

environ 11 ans il y a | 1 réponse | 0

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Question

Decision tree why do I need to prune again although matlab has an automatic pruning included?
Hi! I would like to know why matlab recommends to prune again, although the function fitrtree already includes the function pru...

environ 11 ans il y a | 1 réponse | 0

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Question

Warning iteration limit reached in robust regression - what does it mean?
Hey, in my multiple linear regression I get the following warning - what does it mean? Warning: Iteration limit reached. > ...

environ 11 ans il y a | 1 réponse | 0

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Question

Which decision tree algorithm does matlab use for Regressiontree.fit?
Is it CART as described here http://www.mathworks.com/matlabcentral/answers/82505-what-decision-tree-learning-algorithm-does-mat...

environ 11 ans il y a | 1 réponse | 0

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Question

Standardisation and measurement criteria
Hi everyone, Can anyone help me with this problem: I have used zscore to standardise my linear model with 3 predictor varia...

environ 11 ans il y a | 1 réponse | 0

1

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Question

plot normal distribution plot on histogram of residuals
Does anyone know how to do that? Would be great if it could look like that: <</matlabcentral/answers/uploaded_files/15773/...

environ 11 ans il y a | 1 réponse | 0

1

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Question

rotate tick labels in plot with property editor
Hey! does anyone know how to rotate the tick labels in the property editor? Thanks a lot!

environ 11 ans il y a | 1 réponse | 0

1

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Question

plot diagnostics line unclear if mean leverage
hey! just a quick question: is the line in the plotDiagnositcs plot in the middle the mean average (coefficients/ number of o...

environ 11 ans il y a | 1 réponse | 0

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Question

plotDiagnostics line mit average leverage in foreground
Hey! I have a problem with my average leverage line, you cant really see this line because a lot of my observation points are l...

environ 11 ans il y a | 1 réponse | 0

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Question

Can I use mode for nominal data to calculate most frequent values
Hey! Is it possible to use mode for nominal data or is there something similar I could use to count my nominal data? Eg. I hav...

environ 11 ans il y a | 1 réponse | 0

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Question

How can I change the scale of my boxplot
Hey! I have tried a few times, but somehow I can not change the y-axis scale of my boxplot. At the moment it has 1 2 3 ... x 10...

environ 11 ans il y a | 2 réponses | 0

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réponses

Question

Multiple linear model p value f test t test
Hi! I am a bit confused by the matlab documentation: Linear regression model: y ~ 1 + x1 + x2 + x3 *pVal...

environ 11 ans il y a | 1 réponse | 0

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Question

Using fitlm for multiple linear model: Does this function automatically standardise the variables?
Hi! I just read about standardisation and that it is recommended to standardise variables in a multiple linear model. My qu...

environ 11 ans il y a | 1 réponse | 0

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Question

Rsquare for regresstion tree
Hey! Does anyone know how I can calculate the rsquare for a regression tree? Thank you!:)

environ 11 ans il y a | 2 réponses | 0

2

réponses

Question

Exclude more than one outlier in linear function
Hi, I would like to remove the values under -4.000.000 and over 2.000.000, but I get the following error message: >> outl = ...

environ 11 ans il y a | 2 réponses | 0

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Question

fitlm how to save predicted values?
Hey! For further calculations I need to use my predicted values of my linear model. Using fitlm I get e.g. mdl = Linear...

environ 11 ans il y a | 1 réponse | 0

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Question

plotDiagnostics leverage how does it work
Hey! I have just the plotDiagnostics function (Statistics toolbox) and was wondering what the leverage on the Y means exactly? ...

environ 11 ans il y a | 1 réponse | 0

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Question

fitlm - change the output of this function
Hey! When I use fitlm I always get the following measurement criteria displayed: Number of observations: Error degrees of...

environ 11 ans il y a | 1 réponse | 0

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Question

Why is my resubLoss so high?
Hi, I have used the function rtree =RegressionTree.fit(X,Y), afterwards I have used the function resubLoss(rtree). I got a rea...

environ 11 ans il y a | 1 réponse | 0

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Question

regression tree/classification tree, tree depth, dont understand synatx
Can someone explain me the following syntax (especially the one in bold), which is used in order to determine the optimal tree ...

environ 11 ans il y a | 1 réponse | 0

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Question

Crossval and regressiontree.fit - how does crossval works?
Hey!:) I am using Regressiontree.fit in order to do build a decision tree for my data. If I want it to do cross validation auto...

environ 11 ans il y a | 1 réponse | 0

1

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Question

Nominal variables for dummyvar
Hi! I have a cell array of postcodes. With “postcode=nominal;” I tried to transform it into a nominal variable as I want to cre...

environ 11 ans il y a | 1 réponse | 0

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Question

fitnlm & dummy variables does not work
Hi all, Fitnlm allows automatic creation of dummy variables, if one input the categorical predictor as a nominal or ordinal arra...

environ 11 ans il y a | 1 réponse | 0

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réponse

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