Difference between data from CMPedometer and HealthKit

Question

The following chart lists my step data from HealthKit vs. the CMPedomoter class:

    HealthKit   CMPedometer  difference
1   2710        2681         -29
2   2569        2580          11
3   2367        2312         -55    
4   1326        1311         -15
5   2728        2711         -17
6   860         886           26
7   6293        6299           6

There is a slight difference each day between the two. Does anyone know why this might be the case? No other app is writing step data currently to this device.

Answer 1

Problems is that all steps has Float value so for example in real could be:

time - pure data - after round
1:05 - 0.95 steps - 1 steps 
1:15 - 1.25 steps - 1 steps 
1:25 - 14.75 steps - 15 steps 
1:45 - 1.95 steps - 2 steps 
2:05 - 4.65 steps - 5 steps 
2:15 - 11.25 steps - 11  steps 

and if you sum it like integer you will get 31 steps and if you round it before you will get 35

also had this issue when synch data from pedometer and health kit