r - Random forest output interpretation -



r - Random forest output interpretation -

i have run random forest info , got output in form of matrix. rules applied classify?

p.s. want profile of client output, e.g. person new york, works in technology industry, etc.

how can interpret results random forest?

looking @ rules applied each individual tree

assuming utilize randomforest bundle how access fitted trees in forest.

library(randomforest) data(iris) rf <- randomforest(species ~ ., iris) gettree(rf, 1)

this show output of tree #1 of 500:

left girl right girl split var split point status prediction 1 2 3 3 2.50 1 0 2 0 0 0 0.00 -1 1 3 4 5 4 1.65 1 0 4 6 7 4 1.35 1 0 5 8 9 3 4.85 1 0 6 0 0 0 0.00 -1 2 ...

you start reading @ first line describes root split. root split based on variable 3, i.e. if petal.length <= 2.50 go on left girl node (line 2) , if petal.length > 2.50 go on right girl node (line 3). if status of line -1, on line 2, means have reached leaf , create prediction, in case class 1, i.e. setosa.

it written in manual have @ ?randomforest , ?gettree more details.

looking @ variable importance across whole forest

have @ ?importance , ?varimpplot. gives single score per variable aggregated across whole forest.

> importance(rf) meandecreasegini sepal.length 10.03537 sepal.width 2.31812 petal.length 43.82057 petal.width 43.10046

r profiling output random-forest

Comments

Post a Comment

Popular posts from this blog

web services - java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer -

web services - java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer - when trying request rest service @ time of response getting exception.. feb 21, 2013 2:34:49 pm com.sun.jersey.spi.container.containerresponse mapmappablecontainerexception severe: exception contained within mappablecontainerexception not mapped response, re-throwing http container java.lang.noclassdeffounderror: not initialize class net.sf.cglib.proxy.enhancer @ org.hibernate.proxy.pojo.cglib.cgliblazyinitializer.getproxyfactory(cgliblazyinitializer.java:117) @ org.hibernate.proxy.pojo.cglib.cglibproxyfactory.postinstantiate(cglibproxyfactory.java:43) @ org.hibernate.tuple.entity.pojoentitytuplizer.buildproxyfactory(pojoentitytuplizer.java:162) @ org.hibernate.tuple.entity.abstractentitytuplizer.<init>(abstractentitytuplizer.java:135) @ org.hibernate.tuple.entity.pojoentitytuplizer.<init>(pojoentitytuplizer.java:55) @ org.hibernate.tuple.e...
Read more

Accessing MATLAB's unicode strings from C -

Accessing MATLAB's unicode strings from C - how can access underlying unicode info of matlab strings through matlab engine or mex c interfaces? here's example. let's set unicode characters in utf-8 encoded file test.txt, read as fid=fopen('test.txt','r','l','utf-8'); s=fscanf(fid, '%s') in matlab. now if first feature('defaultcharacterset', 'utf-8') , c engevalstring(ep, "s") , output text file utf-8. proves matlab stores unicode internally. if mxarraytostring(enggetvariable(ep, "s")) , unicode2native(s, 'latin-1') give me in matlab: non-latin-1 characters replaced character code 26. need getting access underlying unicode info c string in unicode format (utf-8, utf-16, etc.), , preserving non-latin-1 characters. is possible? my platform os x, matlab r2012b. addendum: documentation explicitly states "[mxarraytostring()] supports multibyte encoded characters...
Read more

javascript - mongodb won't find my schema method in nested container -

javascript - mongodb won't find my schema method in nested container - i trying access method of schema stored within mixed container. here situation : have cases model can many different things, have schema each of these things stored in "casecontent" mixed property. var caseschema = mongoose.schema({ casecontent : {}, object : {type:string, default : "null"}, collision : {type : boolean, default : false} }); the casecontent property filled model of 1 of schemas, 1 exemple : var treeschema = new mongoose.schema({ applecount : {type : number, default : 3} }); treeschema.methods.dostuff = function (data) { console.log('hey, listen'); homecoming true; }; then, want utilize method of schema original container : caseschema.methods.dostuff = function (data) { if (this.casecontent.dostuff !== undefined) { this.casecontent.dostuff(); console.log('it worked'); } else { ...
Read more