Predicting system performance - method for extrapolating multivariate performance metrics into perdictive equation
performance,regression,prediction,forecasting
Yes - I would use linear regression as a starting point. For an example, see How can I predict memory usage and time based on historical values. I found Data Analysis Using Regression and Multilevel/Hierarchical Models to be s highly readable introduction to the subject (you probably won't need multilevel...
SciKit-learn for data driven regression of oscillating data
python,time-series,scikit-learn,regression,prediction
Here is my guess about what is happening in your two types of results: .days does not convert your index into a form that repeats itself between your train and test samples. So it becomes a unique value for every date in your dataset. As a consequence your models either...
How to do prediction with weka
Trivial Training-validation-test Create two datasets from your labelled instances. One will be training set and the other will be validation set. The training set will contain about 60% of the labelled data and the validation will contain 40% of the labelled data. There is no hard and fast rule for...
Error in predict.lm in R: factor as.factor(daily) has new level 2
Your original data does not have any cases where ApacheData$daily == 2. The lm object has no coefficient associated with it, so it throws an error.
How to calculate PRESS and $R^2_{predicted}$ in Stata automatically
clear all program define press, rclass syntax varlist(fv) [if] [in] /// [fweight aweight pweight iweight] , /// [nodots] gettoken y x : varlist marksample touse preserve quietly keep if `touse' if "`weight'" != "" { local wgt "[`weight'`exp']" } tempvar pred temp prs quietly gen double `pred' = . if...
sequence prediction using HMM Matlab
matlab,machine-learning,sequence,prediction,hidden-markov-models
From what I understand, I'm assuming you're training 200 different classes (HMMs) and each class has 500 training examples (observation sequences). O is the dimensionality of vectors, seems to be correct. There is no need to have a fixed T, it depends on the observation sequences you have. M is...
Cannot generalize my Genetic Algorithm to new Data
statistics,genetic-algorithm,prediction,generalization
The problem with over-fitting is that, within a single data-set it's pretty challenging to tell over-fitting apart from actually getting better in the general case. In many ways, this is more of an art than a science, but here are some general guidelines: A GA will learn to do exactly...
Financial Data Simulator
machine-learning,simulator,prediction
I would suggest R language and forecast package. Please check this SO question as well. It also has some nice graphs features implemented. Here's more info on time series forecasting....
Using Prolog to make a prediction based on the data in a Relational Database
sql-server,prolog,prediction,swi-prolog,expert-system
Yes- you can train a classifier using a machine learning algorithm. Algorithms which work well in prolog are ones that make rule models. For example a decision tree or a rule learner such as ripper. http://www.amazon.co.uk/Programming-Artificial-Intelligence-International-Computer/dp/0321417461 chapter 18 is a good start. There is a LOT of literature on the...
How to select correct neural network topology and have 1D array as input (time series prediction)
neural-network,time-series,prediction
Verba Docent, Exempla Trahunt Solution of Problem #1 While no one may constrain you from constructing a super-NN to train, cross-validate & forward-test/evaluate all of A, B, C & D at once / in parallel. While NN-s are forgiving in terms of (in)dependence of A,B,C,D ( as opposed to some...
R: Limit/Set values of predicted results from linear model
r,statistics,prediction,lm,predict
There are ways to transform your response variable, G in this occasion but there needs to be a good reason to do this. For example, if you want the output to be probabilities between 0 and 1 and your response variable is binary (0,1) then you need a logistic regression....
Generalized additive models for calibration
r,statistics,probability,prediction,calibration
The warning is telling you that predict.gam doesn't recognize the value you passed to the type parameter. Since it didn't understand, it decided to use the default value of type, which is "terms". Note that predict.gam with type="terms" returns information about the model terms, not probabilties. Hence the output values...
R prediction within an interval
r,machine-learning,glm,prediction,random-forest
You need to specify type='response' for this to happen: Check this example: y <- rep(c(0,1),c(100,100)) x <- runif(200) df <- data.frame(y,x) fitgbm <- gbm(y ~ x, data=df, distribution = "bernoulli", n.trees = 100) predgbm <- predict(fitgbm, df, n.trees=100, type='response') Too simplistic but look at the summary of predgbm: > summary(predgbm)...
Best method to creating a Recommendation/Prediction Engine
php,prediction,recommendation-engine
Here's the outline of the simple algorithm I mentioned in the comments. Let's say a user's sliders are: cost=2.3, usability=2.1, functionality=4 You can construct a SQL query that will try to minimise the "total distance" of these values from values in your table. Pseudo-SQL-code: SELECT (cost - 2.3)^2 + (usability...
Machine learning predict text fields based on text fields
machine-learning,amazon,prediction,ibm-watson,predictionio
No, prediction does not only run on numerical fields. It could be anything including text. My guess is that the MovieLens data uses ID instead of actual user and movie names because this saves storage space (this dataset is there for a long time and back then storage is definitely...
use Lenskit to predicate the book rating
java,plugins,prediction,collaborative-filtering,lenskit
First, the traditional way to do this is via cross-validation, where you do a robust randomized splitting of the data into training data and test data. The LensKit Evaluator supports doing this. The Quick Start descries how to get started; also there is a quick start that includes current best...
Getting Warning: “ 'newdata' had 1 row but variables found have 32 rows” on predict.lm in R
This is a problem of using different names between your data and your newdata and not a problem between using vectors or dataframes. When you fit a model with the lm function and then use predict to make predictions, predict tries to find the same names on your newdata. In...
Estimating confidence intervals around Kalman filter
python,numpy,prediction,kalman-filter
The 2D generalization of the 1-sigma interval is the confidence ellipse which is characterized by the equation (x-mx).T P^{-1}.(x-mx)==1, with x being the parameter 2D-Vector, mx the 2D mean or ellipse center and P^{-1} the inverse covariance matrix. See this answer on how to draw one. Like the sigma-intervals the...
ggplot & Confidence Intervals for Holt-Winters Prediction Function
r,ggplot2,prediction,confidence-interval,holtwinters
Typically you call confidence intervals for predictions "prediction intervals". The predict.HoltWinters function will give those to you if you ask for them with prediction.interval=T. So you can do pred <- predict(hw, n.ahead = 10, prediction.interval = TRUE) Now this will change the shape of the values returned. Rather than a...
Can't find PredictionIO admin dashboard (migrating from PredictionIO 0.6.1 to 0.8.4)
java,mongodb,prediction,recommendation-engine,predictionio
The admin GUI is removed during the re-architect of 0.8.x. However, you can accomplish all the admin tasks through command line http://docs.prediction.io/resources/command-line/ -Isabelle ...
In Random Forest - how can I attach the prediction results to the data frame
I can answer only the first part of your question. how can I attach the prediction results to the data frame To do this you can use the cbind function: Considering the results of your predictions: predict(rf) Turn them into a data frame predResults <- data.frame(predict(rf)) And update your original...
logistic regression predicts “NA” probability in R - why?
r,prediction,logistic-regression
Do you have NA in your variables? If so, you'll get NA for predict value.
How to predict healthy of leaf using image processing technique? [closed]
image-processing,classification,bayesian,prediction,matlab-cvst
There are many possible approaches to a problem like this. One common method is the bag-of-features model. Take a look at this example using the Computer Vision System Toolbox in MATLAB.
How do I sum predictions produced from multiple regression models
You should add the errors in quadrature, see for instance this link. For instance: total_error = sqrt(sig_1^2 + sig_2^2 + sig_3^2 ...) ...
Neural Network Predicting Live Market Data [closed]
You are doing Machine Learning and in Machine Learning you never use the training data to evaluate your model. To answer your question, whether you are overfitting, or whether this is normal: If you don't split your dataset into basically training and test, you will be overfitting. First step: Split...
Nonsense prediction using package segmented in R
Since I got the answer from the segmented package maintainer, I decided to share it here. First, up-date the package to version 0.3-1.0 by install.packages("segmented",type="source") After updating, running the same commands leads to: > Y<-c(13,21,12,11,16,9,7,5,8,8) > X<-c(74,81,80,79,89,96,69,88,53,72) > age<-c(50.45194,54.89382,46.52569,44.84934,53.25541,60.16029,50.33870, + 51.44643,38.20279,59.76469) > dat=data.frame(Y=Y,off.set.term=log(X),age=age) >...
How to get a classifier's confidence score for a prediction in sklearn?
python,machine-learning,scikit-learn,probability,prediction
Per the SVC documentation, it looks like you need to change how you construct the SVC: model = SVC(probability=True) and then use the predict_proba method: class_probabilities = model.predict_proba(sub_main) ...
R - How to get one “summary” prediction map instead for 5 when using 5-fold cross-validation in maxent model?
r,maps,prediction,cross-validation,maxent
Sorry to be the bearer of bad news, but based on the source code, it looks like Dismo's predict function does not have the ability to generate a summary map. Nitty-gritty details for those who care: When you call maxent with replicates set to something greater than 1, the maxent...
r - loess prediction returns NA
From the manual page of predict.loess: When the fit was made using surface = "interpolate" (the default), predict.loess will not extrapolate – so points outside an axis-aligned hypercube enclosing the original data will have missing (NA) predictions and standard errors If you change the surface parameter to "direct" you can...
Create a table from different data frames in R
predict(LinearModel.1, data.frame(Xt = seq(0, 100, 10)), interval = "confidence") ...
How to predict probability in logistic regression in SAS?
sas,probability,prediction,logistic-regression
2 ways to get predicted values: 1. Using Score method in proc logistic 2. Adding the data to the original data set, minus the response variable and getting the prediction in the output dataset. Both are illustrated in the code below: *Create an dataset with the values you want predictions...
Writing an equation as a glm in R
Here's a quick hack of a class of linear functions. I'm fairly sure something better must exist somewhere... But anyway: linear <- function(betas){ betas = matrix(betas, ncol=1) ret = list( pred = function(z){ (cbind(1,z) %*% betas)[,1] } ) class(ret)="linear" ret } predict.linear <- function(object, newdata, ...){ object$pred(newdata) } Then you...