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# Tania

Active since 2014

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Question

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...

mehr als 7 Jahre 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...

mehr als 7 Jahre ago | 1 answer | 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 ...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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) ...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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. > ...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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/...

mehr als 7 Jahre 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!

mehr als 7 Jahre 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...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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!:)

mehr als 7 Jahre 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 = ...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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? ...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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 ...

mehr als 7 Jahre 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...

mehr als 7 Jahre 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...

mehr als 7 Jahre ago | 0 answers | 0