*2nd method of measuring Trend – Semi Average method*Under this method, we can calculate trend. For this, you have to show your time series on graph paper. For this time is on x’ax and data like sale , production is on y’ax now make original graph by plotting point on graph paper by seeing time and value of data. After plotting original data , now you can calculate trend line . For calculating trend line , you have to calculate semi average . Semi average means average between two time period .

Here are two method of calculating semi average of data which are given below:-

*1st method is use when data is even*In this case all time series divides in to two parts and then we calculate average of each part suppose if you have 10 years data then you divide into 5 -5 years half and then you will calculate first five year average and then next five year average after this you have to plot this on the graph paper . This will show the trend line .See picture and understand

*2nd method is used when data is odd -*→ in this method you just live middle data and the follow above procedure