revisit_rand | R Documentation |
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.
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 |
n_visit |
If |
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 |
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_bibd
create a balanced incomplete block panel revisit design
revisit_dsgn
create a panel revisit design
pd_summary
to summarize characteristics of a panel revisit design
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
)
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