Renault Twingo "CarBuyer" scored it four out of five stars, praising its maneuverability, design, and rear passenger space but criticizing its wind noise and high price compared to its rivals. "What Car?" gave the car three out of five stars, saying: "The Renault Twingo mixes cheeky retro styling with genuine practicality. It’s neither as refined nor as comfortable as the best city cars, though." The third generation Twingo was previewed through two concepts, the Twin'Z and the Twin'Run. The Twin'Z is a city car concept unveiled in April 2013. Its styling was created in partnership with British designer Ross Lovegrove. According to
Latitude of the Gulf Stream and the Gulf Stream north wall index analysis was then used to find the pattern of variation common to the six longitudes. This is preferable to simple averaging of the six latitude estimates which would emphasise the eastern longitudes where the north-south movements are largest, and possibly obscure smaller but coherent north-south shifts further west. Correlation coefficients are calculated between the six time-series and the principal components are the eigenvectors of the resulting correlation matrix. (Empirical orthogonal function analysis proceeds instead from the variance-covariance matrix which again is biased to the eastern longitudes.) Each principal component is calculated as a weighted average of the standardised latitude series