- #8: Time-series analysis
- review of previous class
- today's topics
- time in measurement
- clock uncertainty
- PC clock
- clock drift
- alternative clocks
- OS time management
- UNIX gettimeofday
- NTP(Network Time Protocol)
- NTP synchronization modes
- NTP symmetric protocol
- NTP system model
- BPF timestamp on BSD Unix
- time-series analysis of network traffic
- autocorrelation of network traffic
- autocorrelation and lag plot
- autocorrelation
- stationary process
- white noise
- non-stationary process
- power spectral density
- characteristics of power spectral density
- short-range dependence and long-range dependence
- self-similar traffic
- self-similarity in network traffic
- previous exercise: linear regression
- script for linear regression
- adding the least squares line to scatter plot
- today's exercise: autocorrelation
- computing autocorrelation functions
- autocorrelation computation code
- autocorrelation plot
- today's exercise 2: traffic analysis
- plotting time-of-day traffic
- script to extract time-of-day traffic
- plot script for time-of-day traffic
- plotting time-of-day traffic for each day of the week
- script to extract time-of-day traffic for each day of the week
- plot script for each day of the week
- correlation coefficient matrix among days of the week
- script to compute correlation coefficient matrix
- assignment 2: twitter data analysis
- twitter data sets
- items to submit
- sort command
- summary
- next class