The Colombia Manufacturing PMI is based on data compiled from replies to questionnaires sent to purchasing managers in a panel of around 350 manufacturers. The panel is stratified by detailed sector and company workforce size, based on contributions to GDP. Survey responses are collected mid-month and denote the direction of change compared with the previous month. A diffusion index is calculated for each survey indicator. The index is the sum of the percentage of ‘higher’ responses and half the percentage of ‘unchanged’ responses. The indices vary between 0 and 100, with a reading above 50 indicating an overall increase and below 50 an overall decrease. The diffusion indices are then seasonally adjusted using an in-house method developed by IHS Markit. The Purchasing Managers’ Index (PMI) is a weighted average of the following five diffusion indices: New Orders (30%), Output (25%), Employment (20%), Suppliers’ Delivery Times (15%) and Stocks of Purchases (10%). For the PMI calculation the Suppliers’ Delivery Times Index is inverted so that it moves in a comparable direction to the other indices.