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Awarded to Tania on 20 Jul 2017
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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...
9 years ago | 0 answers | 1
0
answersQuestion
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...
9 years ago | 1 answer | 0
1
answerQuestion
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 ...
9 years ago | 0 answers | 0
0
answersQuestion
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...
9 years ago | 2 answers | 0
2
answersQuestion
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...
9 years ago | 1 answer | 0
1
answerQuestion
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) ...
9 years ago | 0 answers | 0
0
answersQuestion
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...
9 years ago | 1 answer | 0
1
answerQuestion
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...
9 years ago | 0 answers | 0
0
answersQuestion
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...
9 years ago | 0 answers | 0
0
answersQuestion
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. > ...
9 years ago | 0 answers | 0
0
answersQuestion
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...
9 years ago | 0 answers | 0
0
answersQuestion
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...
9 years ago | 1 answer | 0
1
answerQuestion
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/...
9 years ago | 1 answer | 0
1
answerQuestion
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!
9 years ago | 1 answer | 0
1
answerQuestion
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...
9 years ago | 0 answers | 0
0
answersQuestion
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...
9 years ago | 0 answers | 0
0
answersQuestion
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...
9 years ago | 1 answer | 0
1
answerQuestion
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...
9 years ago | 2 answers | 0
2
answersQuestion
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...
9 years ago | 1 answer | 0
1
answerQuestion
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...
9 years ago | 1 answer | 0
1
answerQuestion
Rsquare for regresstion tree
Hey! Does anyone know how I can calculate the rsquare for a regression tree? Thank you!:)
9 years ago | 2 answers | 0
2
answersQuestion
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 = ...
9 years ago | 2 answers | 0
2
answersQuestion
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...
9 years ago | 1 answer | 0
1
answerQuestion
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? ...
9 years ago | 0 answers | 0
0
answersQuestion
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...
9 years ago | 1 answer | 0
1
answerQuestion
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...
9 years ago | 1 answer | 0
1
answerQuestion
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 ...
9 years ago | 1 answer | 0
1
answerQuestion
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...
9 years ago | 1 answer | 0
1
answerQuestion
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...
9 years ago | 0 answers | 0
0
answersQuestion
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...
9 years ago | 0 answers | 0
0
answers
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