INTRODUCTION
Productivity growth is one of the major sources of economic development and a thorough understanding of the factors affecting productivity is very important. In recent years the measurement and analysis of productivity change has enjoyed a great deal of interest among researchers studying firm performance and behavior.
This study measures productivity growth in university, in addition, focus on the investigation of the causes of productivity change and on its decomposition. Such decompositions promote the understanding of the determinants of better performance and provide valuable information for managers and planners in both the private and the public sector.
In recent research, the malmquist index has become the standard approach to
productivity measurement within the nonparametric literature. The concept of
this index was first introduced by Malmquist (1953)
and has further been studied and developed in the nonparametric framework by
Caves et al. (1982), Fare et
al. (1994a, b) and Cooper et
al. (2007).
The Malmquist index approach to productivity measurement has many advantages.
It is an index representing Total Factor Productivity (TFP) growth of a Decision
Making Unit (DMU), in that it reflects (1) progress or regress in efficiency
along with (2) progress or regress of the frontier technology between two periods
of time. It is based on multi inputoutput frontier representations of the production
technology (Charnes et al., 1978). In the empirical
context, the results are obtained using mathematical programming techniques
(DEA) that rely on minimum assumptions regarding the shape of the production
frontier. Finally, the index decomposes into multiple components to give insights
into the root sources of productivity change. DEAbased Malmquist productivity
index measures the technical and productivity changes over time.
DATA ENVELOPMENT ANALYSIS
Data Envelopment Analysis (DEA) has been recognized as an excellent method
for analyzing performance and modeling organizations and operational processes,
particularly when market prices are unavailable. Unlike the statistical regression
method that tries to fit a regression plane through the center of the data,
DEA floats a piecewise linear surface to rest on top of the data by linear programming
techniques (Odeck, 2000). In other words, the statistical
regression method estimates the parameters in the assumed functional form by
a single optimization over all Decision Making Units (DMUs) whereas DEA uses
optimizations for different DMUs without a priori assumptions on the underlying
functional forms. Because of this unique feature, DEA has been applied to various
areas of efficiency evaluation, for example, individual physician practice,
program evaluation, macroeconomics performance of countries or cities, pollution
prevention, reorganization of forest districts and pupil transportation and
others. The main advantages of DEA that make it suitable for measuring the efficiency
of DMUs are: (1) it allows the simultaneous analysis of multiple outputs and
multiple inputs, (2) it does not require an explicit a priori determination
of a production function, (3) efficiency is measured relative to the highest
observed performance rather than against some average and (4) it does not require
information on prices.
DEA can be applied to panel data to measure the productivity changes between
two periods of activities fulfilled by a specific set of DMUs. For example,
Fare et al. (1994a, b) studied
the productivity change in Swedish individual hospitals operating in a nonmarket
environment. The specific approach used is called Malmquist productivity index
in which DEA efficiency scores are used. Chen and Ali (2004)
applied the DEA Malmquist productivity measure to the computer industries by
the CCR model to assess the four distance functions of Malmquist productivity.
They further analyzed the properties of two ratios of frontier shift, the backward
and forward frontier shifts. The DEA models used in the Malmquist productivity
index can either be input or output oriented. Consequently, the Malmquist productivity
index can be inputoriented when the outputs are fixed at their current levels
or outputoriented when the inputs are fixed at their current levels.
MALMQUIST PRODUCTIVITY INDEX
Suppose we have n DMUs, each DMUj (j = 1,…,n) produces a vector of outputs
y^{t}_{j} = (y^{t}_{1j},..., y^{t}_{kj})
by using a vector of inputs x^{t}_{j} = (x^{t}_{1j},...,
x^{t}_{mj}) at each time period t. The CCR DEA model can be
expressed as (Charnes et al., 1978):
where, x^{t}_{o} = (x^{t}_{1o},..., x^{t}_{mo}) and y^{t}_{o} = (y^{t}_{1o},..., y^{t}_{ko}) are the input and output vectors of DMU_{o} among others. Model (1) is inputoriented, because it considers the possible radial reductions of all inputs when the outputs are fixed at their current levels.
If θ^{t}_{o} = 1; then DMU_{o} is efficient in
time period t; otherwise, if θ^{t}_{o}<1; then DMU_{o}
is inefficient. It can be seen that (1) if θ^{t}_{o} =
1; then DMU_{o} is unable to proportionally reduce its inputs and therefore
DMU_{o} is on the Empirical Production Frontier (EPF); (2) if θ^{t}_{o}<1;
then DMU_{o} can reduce its inputs and therefore DMU_{o} is
operating below the EPF. By replacing x^{t}_{j} and y^{t}_{j}
with x^{s}_{j} and y^{s}_{j}, respectively,
we have the technical efficiency of θ^{s}_{0} for DMU_{o}
at the time period s, From t to s; DMU_{0}’s technical efficiency
may change or (and) the EPF may shift. Based upon model (1), the Malmquist productivity
index can be calculated via (Fare et al., 1994a,
b)
• 
Comparing x^{t}_{o} to EPF at time t; namely,
calculating θ^{t}_{o} = θ^{t}_{o}
(x^{t}_{o}, y^{t}_{o}) 
• 
Comparing x^{s}_{o} to EPF at time s; namely, calculating
θ^{s}_{o} = θ^{s}_{o} (x^{s}_{o},
y^{s}_{o}) 
• 
Comparing x^{t}_{o} to EPF at time s; that is, calculating
θ^{s}_{o} = θ^{s}_{o} (x^{t}_{o},
y^{t}_{o}) through the following linear program: 
• 
Comparing x^{s}_{o} to EPF at time t; namely,
calculating θ^{t}_{o} = θ^{t}_{o}
(x^{s}_{o}, y^{s}_{o}) through the following
linear program: 
The technical efficiency change (catchup) term relates to the degree to which
a DMU improves or worsens its efficiency, while the frontiershift (or innovation)
term reflects the change in the efficient frontiers between the two time periods:
Technical efficiency change = TEC = θ^{s}_{o} 
TEC >1 indicates progress in relative efficiency from period t to s, while
TEC = 1 and TEC <1, respectively indicate no change and regress in efficiency.
In addition to the technical efficiency change term, we must take account of the frontiershift (innovation) effect in order to fully evaluate the productivity change since the technical efficiency change effect is determined by the efficiencies being measured by the distances from the respective frontiers:
This indicator, also decompose to parts
and
which is called the backward and forward frontier shifts, respectively.
Fs_{o} >1 indicates progress in the frontier technology around DMU_{o} from period t to s (t < s), while FS_{o} = 1 and FS_{o} <1, respectively indicate the status quo and regress in the frontier technology.
The Malmquist Index (MI) is computed as the product of (Technical efficiency change) and (Frontier shift), i.e.,
MI_{o} measures the productivity change between periods t and s. Productivity declines if MI_{o} <1; remains unchanged if Mi_{o} = 1 and improves if MI_{o}>1.
DATA DESCRIPTION AND FINDINGS
To evaluate educational system cannot be used of market evaluation mechanisms such as benefit assessment to determine DMU performance or inputs and outputs economic value, because inputs and outputs generally stand in the education, research and service departments which the measurement or presentation of an assessment unit is very difficult. DEA method also emphasizes university targets for inputs and outputs choice and makes possible the choice of qualities input and output indicators to the system.
In this study, the application of DEA method in educational assessment, Islamic Azad University, Zahedan unit's educational departments in two periods of time 20032004 and 20082009 academic years is studied. The Islamic Azad University, Zahedan unit's educational departments are viewed as DMUs (Table 1).
Our original data consist of the annual statistics for the years 2004 and 2009 collected in each of the 21 departments. From these data the outputs and inputs are as shown in Table 2.
The relative efficiencies of each DMU in the period t and s are calculated under model (1). Table 3 shows the results solved models, which are implemented in an MSExcel worksheet and by using the DEA Solver software and LINDO software. The productivity indices for DMUs are determined.
We first look at the technical efficiency changes. The columns 3 and 4 in above Table 3 report the DEA technical efficiency and the associated the technical efficiency changes from 2004 to 2009. The average technical efficiency changes of the universities are 1.01685, which is improved 1.685%.
According to Fig. 1, which shows technical efficiency changes of DMUs, seven departments are efficient in each time period, that is, no technical efficiency change is indicated by TEC. However, we would like to point out that caution should be paid when a DMU is a frontier DMU in time period t and time period s, i.e., although, TEC = 1 indicates no improvement in technical efficiency, these departments stands for the industry best practice in each year. On the other hand, we note that TEC >1 only indicates an improvement in technical efficiency (e.g., Midwifery, Judicial law, Geography,…). This does not necessary mean that these departments have a better performance in improving its technical efficiency than others that are efficient in each two period.
We next look at the frontier shift. The column 8 in Table 3
reports the Malmquist frontier shift component, FS. It can be seen that on average,
the frontier shift improved 3.13% from 2004 to 2009. As indicated by FS (Table
4), nine of the departments show a positive shift and the other twelve of
the departments show a negative shift (Chen and Ali, 2004).
Table 1: 
Input and output categories 

Table 2: 
The gathered information to assess educational departments
of Islamic Azad University, Zahedan Unit, Academic year 2004 and 2009 

Table 3: 
The productivity indices for the DMUs 


Fig. 1: 
The efficiency of DMUs in two periods of time 
Table 4 reports the component shifts in technology frontier and shows average the departments technology frontier has a pure negative shift.
Technology change at the DMU level shows the two ratios associated with the frontier change index are larger than 1 for nine of departments, indicating that these departments stay with a consistent operations strategy. Other departments show a move between two facets, indicating that these departments have a change in operations strategy. The technology of thirteen departments moves from a negative shift facet towards a positive shift facet, indicating a favorable strategy change.
We finally look at the Malmquist productivity index. The column 9 of Table 3 reports Malmquist productivity index, MI. It can be seen that from academic year 20032004 to 20082009, the total productivity indices for the average unit show an increase with scores of 1.0445, with standard deviation 0.167. Industrial department has maximum productivity growth, that is 1.3718 and Agriculture department has maximum regress in productivity, that is 0.8172. The values of inputs and outputs in two periods 2004 and 2009 represent increasing 18 and 12%, respectively. The distribution of total productivity, technical efficiency change and frontier shift across units is shown in Fig. 2.
Figure 2 shows that ten departments have productivity gain since, its MI is greater of 1 (MI>1). In departments of midwifery, industrial and electronics, the malmquist productivity gain is from not only an efficiency improvement, but also a technology movement from negative shift section to positive shift section of the frontier, indicating that these departments have a favorable strategy shift and also gains relative efficiency with respect to a positively shift frontier.
Table 4: 
The backward and forward frontier shifts 

CONCLUSION
This study explored the evolution of productivity of the university departments operating in the Islamic Azad University Zahedan Unit's education departments for the period 20042009.
Since, the Islamic Azad University Zahedan Unit's education departments are part of the public sector where economic behavior is uncertain and there is no price information on the services produced, the Malmquist index based on DEA approach is well suited for productivity measurement in this sector.
With regard to productivity indices, the picture that emerges is one of productivity
growth due to an improvement of production possibilities. The decomposed index
shows that much of the observed progress in total productivity is explained
by the frontier shift term.