How to see the results of kknreg in R

@data_hacks wrote:

Hello,

I am trying to compare linear regression and regression using R.Below is my code for reg using knn:

library(caTools)
set.seed(88)
split=sample.split(sales_store,SplitRatio = 0.6)
train=subset(sales_store,split==T)
test=subset(sales_store,split==F)
#Regression using kNN:
fit <- knnreg(Sales ~ DayOfWeek+Customers+Open+Promo+StateHoliday+SchoolHoliday+Assortment+CompetitionDistance,data = train, k = 11,na.action = na.omit)
knnPredict <- predict(fit,newdata = na.omit(test))

However I am getting an error:

how do I correct this error and see the results of predict?
Also,in linear regression we get the coefficients,R-Sq etc.
Is there something similar in knnreg which I can use to see how strong this regression is??

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