CHAPTER ONE
1.0INTRODUCTION
The term time series refers to one the quantitative method used in determination pattern in data collected over time e.g weekly monthly, quarterly or yearly.
Time service is the statistic tool or methodology that can be used to transform past experience to predict future event which would enable the researcher or organization to plan.
It gives information about how the particular case of study has been behaving in the past and present and such information can be used in prediction The number of people treated for malaria fever at the otan Ayegbaju management hospital. Comprehensive health centre otan. We are going to seen how change occur over mouths in each year in the occurrence of the disease in the hospital.  As a result of this, we will be able to know certain factor responsible for increase or decrease in the rate of infection of the disease over the period of time.
Record of time series data can be made in the following ways:-
A.   THROUGH CUMULATIVE FIGURES:- these represent value of input through the quarter. We must always bear in mind the different when handling time series data and as certain which particular type we are dealing with in every case.
B.   CUMULATIVE TYPE ADDED COMPILATION:- some cases when an added compilation introduced for the cumulative type of data the figure which are related to month of the year and not  the total for month. further more the characteristic movement, seasonal variation Irregular variation in the analysis of time series, we have two types of model are generally accepted as good approximation of the true data association among the component of observed data, they are the most commonly assumed relationship between time series and its components. These are additive model and Multiplicative mode. All time series contain at least on of four of its components. These components are:-
1.    Long term trend
2.    Seasonal variation
3.    Cyclical variation
4.    Irregular or random variation value
IRREGULAR OR RANDOM COMPONENT
This venation cannot BE attributed to any of three previously discussed component in the sense that is unpredictable.
            Irregulars flotation can be cause by many factor such as war, flood drought and other human as action. Two type of irregular variation may exit in a time series viz. minor and major irregularities minor irregularities show up as serivtooth like pattern are under the long term trend. These irregularited are in organization long term operation: