# Trend Analysis

Trend analysis checks for the following trends:

# Runs Up

The Runs Up trend control check is violated for the mean chart whenever the mean of the sample just collected is greater than mean of the previous sample. Size of the trend is specified in the spin box. If size of the trend is 3, then if mean of the last three consecutive samples that is up then trends Runs Up will get raised for mean chart.

The Runs Up trend control check is violated for the range chart whenever the range of the sample just collected greater than range of the previous sample. Size of the trend is specified in the spin box. If size of the trend is 3, then if range of last three consecutive samples is up then trends Runs Up will get raised for range chart.

# Runs Down

The Runs Down trend control check is violated for the mean chart whenever the mean of the samples just collected less than mean of the previous sample. Size of the trend is specified in the spin box. If size of the trend is 3, if last three consecutive samples are down then trends Runs Down will get raised for mean chart.

The Runs Down trend control check is violated for the range chart whenever the range of the samples just collected less than range of the previous sample. Size of the trend is specified in the spin box. If size of the trend is 3, if last three consecutive samples are down then trends Runs Down will get raised for range chart.

# Runs Greater Than

The Runs Greater Than mean trend control check is violated for the mean chart whenever the mean of the sample just collected, and the mean of the previous samples, all lie above the current center line of the mean chart. Size of the trend is specified in the spin box. If size of the trend is 3, if last three consecutive samples are lie above the current centerline of the mean chart then trends Runs Greater than Mean will get raised for mean chart.

The Runs Greater Than Mean trend control check is violated for the range chart whenever the range of the sample just collected, and the range of the previous samples, all lie above the current centerline of the range chart. Size of the trend is specified in the spin box. If size of he trend is 3, if last three consecutive samples are lie above the current center line of the range chart then trends Runs Greater Than Range will get raised for range chart.

# Runs Less Than

The Runs Less Than mean trend control check is violated for the mean chart whenever the mean of the sample just collected, and the mean of the previous samples, all lie below the current center line of the mean chart. Size of the trend is specified in the spin box. If size of the trend is 3, if last three consecutive samples are lie below the current centerline of the mean chart then trends Runs Less Than Mean will get raised for mean chart.

The Runs Less Than range trend control check is violated for the range chart whenever the range of the sample just collected, and the range of the previous samples, all lie below the current centerline of the range chart. Size of the trend is specified in the spin box. If size of the trend is 3, if last three consecutive samples are up and all lie below the current centerline of the range chart then trends Runs Less Than Range will get raised for range chart.