A data server, comprising: a processor; and a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for: acquiring (905; 955) a current condition indicator of a condition indicator set associated with an operating condition of a vehicle, the condition indicator set indicating sensor readings associated with an operating element of the vehicle under the operating condition over a predetermined period of time; determining a volatility (913; 963) of a first portion of the condition indicator set, wherein the first portion of the condition indicator set includes the current condition indicator; determining (907, 909; 957, 959) one or more moving averages of a second portion of the condition indicator set, wherein each condition indicator in the second portion of the condition indicator set is prior to the current condition indicator and one or more calculation windows for the one or more moving averages each lag a calculation window for the volatility by at least one condition indicator; determining (923; 973) whether a trend associated with the operating element is indicated according to at least the current condition indicator, at least one previous condition indicator of the condition indicator set, the one or more moving averages and the volatility; and generating (925; 975) an alert signal in response to the determining (923; 973) that the trend is indicated. a processor; and a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for: acquiring (905; 955) a current condition indicator of a condition indicator set associated with an operating condition of a vehicle, the condition indicator set indicating sensor readings associated with an operating element of the vehicle under the operating condition over a predetermined period of time; determining a volatility (913; 963) of a first portion of the condition indicator set, wherein the first portion of the condition indicator set includes the current condition indicator; determining (907, 909; 957, 959) one or more moving averages of a second portion of the condition indicator set, wherein each condition indicator in the second portion of the condition indicator set is prior to the current condition indicator and one or more calculation windows for the one or more moving averages each lag a calculation window for the volatility by at least one condition indicator; determining (923; 973) whether a trend associated with the operating element is indicated according to at least the current condition indicator, at least one previous condition indicator of the condition indicator set, the one or more moving averages and the volatility; and generating (925; 975) an alert signal in response to the determining (923; 973) that the trend is indicated. acquiring (905; 955) a current condition indicator of a condition indicator set associated with an operating condition of a vehicle, the condition indicator set indicating sensor readings associated with an operating element of the vehicle under the operating condition over a predetermined period of time; determining a volatility (913; 963) of a first portion of the condition indicator set, wherein the first portion of the condition indicator set includes the current condition indicator; determining (907, 909; 957, 959) one or more moving averages of a second portion of the condition indicator set, wherein each condition indicator in the second portion of the condition indicator set is prior to the current condition indicator and one or more calculation windows for the one or more moving averages each lag a calculation window for the volatility by at least one condition indicator; determining (923; 973) whether a trend associated with the operating element is indicated according to at least the current condition indicator, at least one previous condition indicator of the condition indicator set, the one or more moving averages and the volatility; and generating (925; 975) an alert signal in response to the determining (923; 973) that the trend is indicated.