Johnston F.R.

F.R. Johnston

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Found 11 papers in total
Characterizing the frequency of orders received by a stockist
Characterizing the frequency of orders received by a stockist
2008
It is regularly asserted that the frequency of orders received by a stockist can be...
Forecasting for intermittent demand: the estimation of an unbiased average
Forecasting for intermittent demand: the estimation of an unbiased average
2006
The majority of the range of items held by many stockists exhibit intermittent demand....
An examination of the size of orders from customers, their characterisation and the implications for inventory control of slow moving items
An examination of the size of orders from customers, their characterisation and the implications for inventory control of slow moving items
2003
This paper examines half a million observations of the size of orders from customers...
Optimality and robustness of combinations of moving averages
Optimality and robustness of combinations of moving averages
2003
A combination of moving averages has been shown previously to be more accurate than...
A robust forecasting system, based on the combination of two simple moving averages
A robust forecasting system, based on the combination of two simple moving averages
1999
For series with negligible growth and seasonality, simple moving averages are...
Some properties of a simple moving average when applied to forecasting a time series
Some properties of a simple moving average when applied to forecasting a time series
1999
Simple (equally weighted) moving averages are frequently used to estimate the current...
Variance laws for inventory management
Variance laws for inventory management
1996
In forecasting for inventory management, the demand variance for each stock-keeping...
Forecasting for items with intermittent demand
Forecasting for items with intermittent demand
1996
In a service environment, a stockist usually has many slow moving items whose...
How far ahead can an EWMA model be extrapolated?
How far ahead can an EWMA model be extrapolated?
1994
The existence of uncertainty is a feature of the business world. Forecasting does not...
Relationships between service level measures for inventory systems
Relationships between service level measures for inventory systems
1994
The service level provided by an inventory system can be measured in various ways. If...
Exponentially Weighted Moving Average (EWMA) with irregular updating periods
Exponentially Weighted Moving Average (EWMA) with irregular updating periods
1993
This paper shows how to modify the smoothing constant for use in an Exponentially...
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