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TTVs are derived from Q1-Q17 Kepler data.  x-axes: “Observed Tc” (Mid-Transit Time): EXOFAST’s best-fits from Normalized PDCSAP_FLUX Kepler light flux vs. time (BJD_tdb - 2454900) data.  y-axes: “(O – C)”: difference between Observed Tc and the Calculated Tc from the graphically obtained linear ephemeris.

Figure: KOI-3398.02, P = 35.80 days [Plot avg. error bars = ± 9.11 min.]
TTV_minimum: 99.09 ± 11.60 days, Amp_ttv_minimum: -54.75 ± 14.21 min.
TTV_maximum: 191.28 ± 11.80 days, Amp_ttv_maximum: 53.64 ± 14.21 min.
TTV_minimum: 283.46 ± 12.10 days, Amp_ttv_minimum: -54.75 ± 14.21 min.
TTV_maximum: 375.65 ± 12.52 days, Amp_ttv_maximum: 53.64 ± 14.21 min.
TTV_minimum: 467.83 ± 13.03 days, Amp_ttv_minimum: -54.75 ± 14.21 min.
TTV_maximum: 560.02 ± 13.63 days, Amp_ttv_maximum: 53.64 ± 14.21 min.
TTV_minimum: 652.20 ± 14.30 days, Amp_ttv_minimum: -54.75 ± 14.21 min.
TTV_maximum: 744.38 ± 15.04 days, Amp_ttv_maximum: 53.64 ± 14.21 min.
TTV_minimum: 836.57 ± 15.83 days, Amp_ttv_minimum: -54.75 ± 14.21 min.
TTV_maximum: 928.75 ± 16.67 days, Amp_ttv_maximum: 53.64 ± 14.21 min.
TTV_minimum: 1020.94 ± 17.56 days, Amp_ttv_minimum: -54.75 ± 14.21 min.
TTV_maximum: 1113.12 ± 18.47 days, Amp_ttv_maximum: 53.64 ± 14.21 min.
TTV_minimum: 1205.31 ± 19.42 days, Amp_ttv_minimum: -54.75 ± 14.21 min.
TTV_maximum: 1297.49 ± 20.40 days, Amp_ttv_maximum: 53.64 ± 14.21 min.
TTV_minimum: 1389.68 ± 21.39 days, Amp_ttv_minimum: -54.75 ± 14.21 min.
P_ttv: 184.37 ± 2.39 days.
Amp_ttv: 108.39 ± 20.09 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 184.00 days; Power: 5.81; FAP: 0.00985.
Linear ephemeris (this work): Tc = [35.80024559 ± 0.00061129](Tc#) + [77.90879883 ± 0.01432644]


Numerous literature and major Tc#, Tc, and TTV tabulation references can be found on my "Summary" webpage following the table.

15 April 2015
                Kepler KOI-3398 (KIC-3561464) 4-(or more?)-Planet System

Discussion:
In the example of KOI-3398.02, a sinusoidal curve-fit of the (O-C) vs. Time data showed (Figure below) a periodicity (P_ttv) of 184.37 ± 2.39 days; 184.00 days was observed in the Lomb-Scargle Periodogram (LSP) of the same data.
Neither of the other two known transiting exoplanets in this system (3398.01 and 3398.03) showed any significant TTVs.