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...und the previous post of the person who had the same issue, but the suggested solution in that post did not help me. I created the matrices: ResponseMatrix <- data.frame (GAOdecision=GAOdecision) PredictorsMatrix <- data.frame (WeaponvsNon = WeaponvsNon, ProductvsService = ProductvsService, KDuration = KDuration, BusinessSize = BusinessSize, Bidders = Bidders, Staging = Staging, Criteria = Criteria, KPricing = KPricing, Political = Political) and then output <- lars(PredictorsMatrix, ResponseMatrix) *Error in one %*% x : requires numeric/complex matrix/vector arguments* * * I did not cre...