[R] Forecasting tutorial "Basic Forecasting"

[Bill Poling]

Hi. I am trying to follow this forecasting tutorial at: https://www.r-bloggers.com/basic-forecasting/

Using my own data, I cannot get past the first step, lots of laughs.

dat3 <- structure(c(5973156.76, 5159011.20,  6695766.64,  6365359.00,  6495218.53,  7226302.39,  6835272.70,  7383501.57,  6962748.19,  7623278.72,  7274994.33
                    ,7919421.80,  7360740.81,  7436693.35, 8545765.55,  7337269.76,  8180585.44,  8376635.05,  7758261.24, 10374641.22,  8000314.11,  9114958.90
                    ,9805149.15,  9336939.45, 10273849.10,  9159308.71, 10184703.33, 10251153.52
                    ,-52340.21,  -90911.29,  -90135.33, -147196.03, -112831.26,  -99443.31,  -72584.09, -161869.48, -117805.41,  -81102.39, -175379.25, -190596.12
                    ,-110838.08, -127953.99, -129414.01, -131570.11,  -28814.27,  -63066.40, -134587.17,  -27610.96, -169293.37, -144034.70, -193376.36, -135743.08
                    ,-151767.63, -156816.35, -113074.01, -160705.61
                    ,-700973.75,  -891171.15,  -805670.71,  -821222.02, -1078184.45,  -980080.81,  -786506.89, -1244278.50, -1392779.81, -1186436.41, -1108016.28
                    ,-1201663.88, -1163848.16, -1028830.60, -1507572.01, -1210422.01, -1529691.90, -1207461.55, -1615971.18,  -978028.10, -1354515.28, -1624270.48
                    , -1596204.33, -1836731.26, -1310376.81, -1337718.49, -1492220.98, -1421801.16)
                    ,.Dim = c(28L, 3L)
                    ,.Dimnames = list(NULL, c("TotalNetRev","TotalRevAdjusted" ,"TotalRevCancelled"))
                    ,.Tsp = c(2016, 2018, 12)
                   , class = c("mts", "ts", "matrix"))

Error in attributes(.Data) <- c(attributes(.Data), attrib) :
  invalid time series parameters specified

I think the error may be due to 28 months of data, complete 2016 & 2017 but only 4 months in 2018 and my Tsp is a value of 12? If so how would I adjust?

I have googled a few references for the error, but the solution is not clear to me.
https://stackoverflow.com/questions/32369737/error-invalid-time-series-parameters-specified-in-backtesting-r-script
http://r.789695.n4.nabble.com/How-to-setup-the-tsp-attribute-of-a-dataset-td908269.html

Thanks for any advice.

WHP


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