what is principal curve and what is meant by it? can you use principal curve analysis to find the path running along the track how would you use principal curves can you use principal curves to fit a track can principal curves fit a cloud principal curve of the road what is principal curve analysis for driving why use principal curves why use principal curve analysis what is principal curve analysis can you use principal curves in gps can you use principal curves to fit a cloud why use principal curve what is principal curve can i use principal curve analysis in math to predict the path along a trail? can principal curve be fit in a vector cloud? how to use principal curves analysis what is the principle of principal curve analysis can you use principal curve to fit a point why can't i use principal curve