revisit_rand: Create a Revisit Design with Random Assignment to Panels and...
In mhweber/spsurvey: Spatial Survey Design and Analysis

Description Usage Arguments Details Value Author(s) See Also Examples

Create a revisit design for a survey that specifies the panels and time periods that will be sampled by random selection of panels and time periods. Three options for random assignments are "period" where the number of time periods to be sampled in a panel is fixed, "panel" where the number panels to be sampled in a time period is fixed, and "none" where the number of panel-period combinations is fixed.

1 2	revisit_rand(n.period, n.pnl, rand.control = "period", n.visit, nsamp, panel_name = "Random", begin = 1, skip = 1)

`n.period`	Number of time periods for the survey design. Typically, number of periods if sampling occurs once per period or number of months if sampling occurs once per month. (v, number of varieties (or treatments) in BIBD terms)
`n.pnl`	Number of panels
`rand.control`	Character value must be "none", "panel", or "period". Specifies whether the number of sample events will be fixed for each panel ("panel"), for each sample occasion ("occasion"), or for total panel-period combinations ("none"). Default is "panel".
`n.visit`	If rand_control is "panel", this is the number of panels that will be sampled in each time period. If rand_control is "period", this is the number of time periods to be sampled in each panel. If rand_control is "none", this is the total number of panel-period combinations that will have units sampled in the revisit design.
`nsamp`	Number of samples in each panel.
`panel_name`	Prefix for name of each panel
`begin`	Numeric name of first sampling occasion, e.g. a specific period.
`skip`	Number of sampling occasions to skip between planned sampling periods, e.g., sampling will occur only every 5 periods if skip = 5.

The revisit design for a survey is created by random selection of panels and time periods that will have sample events. The number of sample occasions that will be visited by a panel is random.

A two-dimensional array of sample sizes to be sampled for each panel and each time period.

Tony Olsen Olsen.Tony@epa.gov

revisit_dsgn: create a panel revisit design
revisit_bibd: create a balanced incomplete block panel revisit design
panel_summary: summarize characteristics of a revisit panel design
power.dsgn: power calculation for multiple panel designs
cov.panel.dsgn: covariance matrix for a panel design
plot_powerpaneldesign: plot power curves for panel designs

revisit_rand(n.period = 20, n.pnl = 10, rand.control = "none", n.visit = 50,
             nsamp = 20)
revisit_rand(n.period = 20, n.pnl = 10, rand.control = "panel", n.visit = 5,
             nsamp = 10)
revisit_rand(n.period = 20, n.pnl = 10, rand.control = "period",
              n.visit = 5, nsamp = 10)