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# Tania

Active since 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...

8 years ago | 0 answers | 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...

8 years ago | 1 answer | 0

### 1

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 ...

8 years ago | 0 answers | 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...

8 years ago | 2 answers | 0

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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...

8 years ago | 1 answer | 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) ...

8 years ago | 0 answers | 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...

8 years ago | 1 answer | 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...

8 years ago | 0 answers | 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...

8 years ago | 0 answers | 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. > ...

8 years ago | 0 answers | 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...

8 years ago | 0 answers | 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...

8 years ago | 1 answer | 0

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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/...

8 years ago | 1 answer | 0

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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!

8 years ago | 1 answer | 0

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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...

8 years ago | 0 answers | 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...

8 years ago | 0 answers | 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...

8 years ago | 1 answer | 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...

8 years ago | 2 answers | 0

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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...

8 years ago | 1 answer | 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...

8 years ago | 1 answer | 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!:)

8 years ago | 2 answers | 0

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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 = ...

8 years ago | 2 answers | 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...

8 years ago | 1 answer | 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? ...

8 years ago | 0 answers | 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...

8 years ago | 1 answer | 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...

8 years ago | 1 answer | 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 ...

8 years ago | 1 answer | 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...

8 years ago | 1 answer | 0

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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...

8 years ago | 0 answers | 0